Arsenal manager Arsene Wenger was unhappy was not impressed with referee Mark Clattenburg for awarding the corner which led to Ashley Williams' winner in Arsenal's 2-1 defeat to Everton.
The Gunners were well in control after Alexis Sanchez's opener, but failed to press home their advantage and the Toffees, low on confidence after just one win in 10 league matches, found a spark to ignite their game.
Seamus Coleman scored an important equaliser just before the break to cap a lengthy spell of growing pressure and four minutes from the end Williams headed in the winner before Phil Jagielka was sent off for a second bookable offence in added time.
It marked a significant turnaround for Williams himself, scoring his first goal since arriving at Goodison in the summer, having clattered team-mate Idrissa Gana Gueye with a knee-high challenge in the build-up to Arsenal's goal, which deflected in off him.
"Of course, it was no corner. You can see it was no corner," he said after the team's 14-match unbeaten league record was ended.
"I am really disappointed in Mr Clattenburg. He is in a really good position to see it and it is not the first time we are really unlucky with his decisions.
"The referee made his decision, but that does not explain why we did not head the ball.
"We have to look at ourselves. We started well and after that lost a bit of urgency.
"We were a bit too comfortable and Everton made it very physical.
"I believe they disturbed our game and we created less. In the end unfortunately we didn't take our chance or two.
"They played a cup game. That is a big difference from what I saw recently from them.
"I don't think they can repeat that in every game."