Arsenal and Crystal Palace drew 2-2 on Sunday in the Premier League at the Emirates Stadium.
The Gunners were off to a quick start after only seven minutes when Sokratis Papastathopoulos punished poor defending by the visitors from a corner.
Lightning struck twice two minutes later from another Arsenal corner after David Luiz headed home to double the lead.
The video assistant referee decided Arsenal's Calum Chambers fouled Wilfried Zaha in the box after 32 minutes, allowing Luka Milivojevic to make it 2-1 from the penalty spot.
It was 2-2 seven minutes into the second half.