Interesting from Graham Scott in the Athletic:
“Back at Stockley Park, there are safety nets in place that should still prevent this kind of error. Sitting next to Donohue yesterday was a Premier League assistant referee whose job includes challenging the VAR if they follow the wrong process. It is impossible to know this for sure unless audio is released from the incident, but we have to assume he did not do so.
Furthermore, just along the corridor there is an operations room where Pro Ref managers and other VAR hub staff follow every match in progress. This can be challenging if there are several being played at once, but on Sunday afternoon, there was only one going on.
The Pro Ref staff have a hotline to the VAR and a mandate to intervene if they think he is making a palpably incorrect call in law or has not given due consideration to all the elements of the process.
Again, while we don’t know this for certain, based on the outcome, we have to assume nothing happened there”