Watford boss Malky Mackay believed the Hornets were more than worthy of a point and slammed the referee's verdict on his side's goal that was scratched off.
The Hornets had reason to feel aggrieved after seeing a goal disallowed for pushing in the Barnsley box, while Mackay's men were also denied a penalty when Henri Lansbury was felled in the Barnsley penalty area, but referee Fred Graham was not interested.
The only goal of the game came nine minutes into the second half when unmarked Emil Hallfredsson raced into the penalty area and fired home from 12 yards.
On the disallowed goal, Mackay said: "I've looked at it on video five or six times and there was no push by Danny Graham. It was clear that he headed the ball and there was no pushing.
"I thought we deserved more than we got out of the game. We picked up from where we left off against Sheffield United.
"I was pleased with the side's performance. I thought we gave a good account of ourselves. We knew it was going to be a tough game."