David Perkins curled in a late equaliser to deny Crystal Palace victory in their first game since manager Dougie Freedman's departure.
The Barnsley midfielder struck after Glenn Murray's first-half opener had put Palace on course for victory.
Assistant boss Lennie Lawrence and first-team coach Curtis Fleming were in charge of Palace after Freedman agreed to take the manager's job at Bolton.
Murray touched in Jonathan Parr's low cross, but Perkins rescued a point.
Palace, who extended their unbeaten run to nine matches, had a great early chance when Murray fired over with a first-time shot from Yannick Bolasie's left-wing cross.
But the striker was clinical from Parr's delivery in the 11th minute, giving Barnsley keeper Ben Alnwick no chance.
Alnwick then clawed away Murray's back-post header from an Owen Garvan corner, and Barnsley boss Keith Hill responded with a tactical switch to bolster his midfield - bringing on Matt Done for forward Chris Dagnall.
The change brought a response from the home side, who were missing eight-goal top scorer Craig Davies because of a hamstring injury.
Marlon Harewood's effort was blocked by Damien Delaney before Done forced Palace goalkeeper Julian Speroni to make an excellent save.
In the second half, substitute Danny Rose fired over after being teed up by Harewood, but Barnsley had a let-off when Kagisho Dikgacoi's cross-shot drifted over Alnwick and hit the inside of the post.
They made the most of it as Perkins levelled when he picked up a loose ball on the edge of the area before curling a shot into the top corner.
Barnsley manager Keith Hill:
"I'm slightly frustrated. We once again help the opposition's tactics. They defend excellently and exploit the counter-attack but it was helped by our inadequacies.
"It took a marvellous piece of ability from David Perkins, because I couldn't see us breaking down the block.
"His performance was incredible. I'm really pleased that he scored that goal."
Crystal Palace caretaker manager Lennie Lawrence:
"We found ourselves in a situation where we were asked to take the team after Dougie's departure and we've been as professional as we can be in our preparation, and we certainly were as professional as we could be out on the pitch.
"I don't know what happens now, we just take it day by day and pitch up tomorrow and see what transpires. I can't speculate on what might happen as the decisions are for the owners to make and we'll just carry on until sometime tells us otherwise.
"Dougie phoned us before the game to wish us well, which is typical of him. It's been a great experience working under him and terrific experience to work at Crystal Palace - the owners have been very supportive."
Live Text Commentary
Full Time The game is over, as the referee blows his whistle.90:00 +2:59
Outswinging corner taken from the left by-line by Owen Garvan.89:33
Corner taken left-footed by Jacob Mellis, Mile Jedinak makes a clearance.89:21
Jacob Mellis takes a shot. Damien Delaney gets a block in.88:28
Owen Garvan concedes a free kick for a foul on Kelvin Etuhu. Ben Alnwick takes the free kick.87:43
Matty Done gives away a free kick for an unfair challenge on Kagisho Dikgacoi. Direct free kick taken by Julian Speroni.86:54
Stephen Foster concedes a free kick for a foul on Glenn Murray. Free kick taken by Owen Garvan.85:48
Assist by Jacob Mellis.85:48 Goal scored
Goal! - David Perkins - Barnsley 1 - 1 C Palace David Perkins gets on the score sheet with a goal from long range to the top left corner of the goal. Barnsley 1-1 Crystal Palace.82:47
Inswinging corner taken from the right by-line by Scott Golbourne, clearance by Peter Ramage.81:49
The ball is crossed by John Stones, Peter Ramage makes a clearance.79:27 Substitution
Substitution Andre Moritz goes off and Stuart O'Keefe comes on.78:03
Centre by Scott Golbourne, save by Julian Speroni.77:13
Kagisho Dikgacoi delivers the ball.76:14
Scott Wiseman challenges Glenn Murray unfairly and gives away a free kick. Andre Moritz produces a shot on goal direct from the free kick.75:07
Effort on goal by Danny Rose from just inside the area clears the crossbar.70:26
Mile Jedinak crosses the ball in from the free kick.70:26 Booking
Booking The referee shows Stephen Foster a yellow card for unsporting behaviour.70:12
Free kick awarded for a foul by Stephen Foster on Andre Moritz.68:22
Kagisho Dikgacoi challenges Scott Golbourne unfairly and gives away a free kick. Ben Alnwick restarts play with the free kick.
Inswinging corner taken left-footed by Owen Garvan from the right by-line, Stephen Foster manages to make a clearance.66:38 Substitution
Substitution Stephen Dawson goes off and Danny Rose comes on.66:38
Unfair challenge on Stephen Dawson by Glenn Murray results in a free kick. Ben Alnwick restarts play with the free kick.65:51
Marlon Harewood is flagged offside by the assistant referee. Julian Speroni restarts play with the free kick.64:52
The referee blows for offside. Scott Wiseman restarts play with the free kick.61:02
The ball is swung over by Scott Golbourne, clearance by Damien Delaney.59:55
Jacob Mellis decides to take a short corner.59:19
Glenn Murray challenges Stephen Foster unfairly and gives away a free kick. Ben Alnwick takes the direct free kick.57:42
Andre Moritz takes a shot. Blocked by Scott Wiseman.57:09
Glenn Murray gives away a free kick for an unfair challenge on Stephen Foster. David Perkins restarts play with the free kick.55:28
Inswinging corner taken left-footed by Owen Garvan from the right by-line, clearance by Stephen Foster.48:06
Inswinging corner taken by Jacob Mellis, Joel Ward manages to make a clearance.46:52
Stephen Dawson fouled by Owen Garvan, the ref awards a free kick. Direct free kick taken by David Perkins.45:01
The referee blows his whistle to start the second half.45:00 +2:30 Half time
Half Time The ref blows to end the first period.45:00 +2:11
Kagisho Dikgacoi takes a shot. Save by Ben Alnwick.45:00 +0:28
Stephen Dawson challenges Yannick Bolasie unfairly and gives away a free kick. Free kick taken by Andre Moritz.44:32
Jacob Mellis takes a shot. Julian Speroni makes a save.44:18
Free kick awarded for an unfair challenge on David Perkins by Mile Jedinak. David Perkins restarts play with the free kick.43:23
Yannick Bolasie takes the inswinging corner, save by Ben Alnwick.40:26
Stephen Dawson has an effort at goal from deep inside the area missing to the left of the goal.38:14
Unfair challenge on Stephen Foster by Glenn Murray results in a free kick. Stephen Foster takes the direct free kick.35:06
Scott Golbourne crosses the ball, Effort from deep inside the area by Marlon Harewood misses to the right of the target.31:05
Mile Jedinak fouled by Marlon Harewood, the ref awards a free kick. Julian Speroni takes the direct free kick.30:29
Owen Garvan takes a shot from deep inside the box clearing the bar.29:36 Substitution
Substitution Kelvin Etuhu comes on in place of Tomasz Cywka.25:57
Joel Ward takes a shot. Save by Ben Alnwick.23:30
The referee blows for offside. Scott Wiseman takes the free kick.23:09
Marlon Harewood takes a shot. Save made by Julian Speroni.22:33
Foul by Glenn Murray on Stephen Foster, free kick awarded. Ben Alnwick takes the direct free kick.22:14
Unfair challenge on Glenn Murray by Stephen Dawson results in a free kick. Yannick Bolasie takes the direct free kick.21:54
Jacob Mellis decides to take the corner short.21:39
Corner taken by Jacob Mellis from the left by-line, Yannick Bolasie makes a clearance.21:23
Matty Done takes a shot. Save by Julian Speroni.20:42
Scott Golbourne sends in a cross, clearance made by Yannick Bolasie.18:54
Matty Done has an effort at goal from outside the area missing to the wide right of the goal.18:10
Jacob Mellis takes the inswinging corner, Mile Jedinak manages to make a clearance.17:37
Inswinging corner taken by Jacob Mellis, Marlon Harewood takes a shot. Save by Julian Speroni.17:18
Foul by Glenn Murray on Scott Golbourne, free kick awarded. Scott Golbourne takes the direct free kick.16:44 Substitution
Substitution Matty Done replaces Chris Dagnall.15:44
Marlon Harewood takes a shot. Blocked by Peter Ramage.14:39
Free kick awarded for an unfair challenge on Tomasz Cywka by Owen Garvan. Free kick taken by Stephen Dawson.14:28
Centre by Jonathan Parr, Ben Alnwick makes a save.12:47
Inswinging corner taken from the left by-line by Kagisho Dikgacoi, save made by Ben Alnwick.11:55
Inswinging corner taken left-footed by Owen Garvan from the right by-line, Glenn Murray takes a shot. Save by Ben Alnwick.10:05
Jonathan Parr provided the assist for the goal.10:05 Goal scored
Goal! - Glenn Murray - Barnsley 0 - 1 C Palace Glenn Murray fires in a goal from close range to the top right corner of the goal. Barnsley 0-1 Crystal Palace.8:16
The ball is sent over by Jonathan Parr, save by Ben Alnwick.6:43
Stephen Dawson takes a shot. Blocked by Yannick Bolasie.4:52
The ball is delivered by Kagisho Dikgacoi, Glenn Murray produces a header from inside the area that goes over the crossbar.3:44
Foul by Tomasz Cywka on Andre Moritz, free kick awarded. Free kick taken by Owen Garvan.1:24
Mile Jedinak decides to take a short corner.1:00
Mile Jedinak takes a shot. Stephen Foster gets a block in.0:00
The referee gets the match started.
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