Everton assistant manager Steve Round slammed Lee Mason after the referee denied Nikica Jelavic a goal against Wolverhampton.
The Croatian striker hit the back of the net in the first half but the goal was incorrectly ruled out for offside by Mason.
After the 0-0 draw, Round was frustrated that Everton was denied the win due to a refereeing error.
"We are disappointed," Round said.
"We thought we created enough opportunities to win the game and it's a game we dominated from start to finish so we're a bit disappointed in the dressing room.
"It was a perfectly good goal (from Jelavic) but some you get, some you don't."
Wolverhampton caretaker manager Terry Connor apologised to his team's fans after the draw.
Connor admitted Wolves, who have already been relegated, had let their supporters down.
The players came back onto the pitch after the game to thank the fans.
"(The fans) were great, the ones that stayed behind," Connor said.
"For the majority of the season they've been great.
"We've had a disappointing season in many ways, we've been up and down and in a way we've let them down so it was nice that they were able to stay behind and we were able to show our appreciation for the support we've had."