Referee chief Mike Riley wants to make it more clear to fans in the stadium when the video referee is being used, with explanations on the big screen one of the options under consideration.
Neil Swarbrick, a video assistant referee, was assessing footage of the third-round game at a control room in west London as part of global trials of the new technology that will be used for match-changing incidents.
"It has gone very well in the first few games", Riley told BBC Radio 5 Live.
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"The whole idea of the protocol is to have minimum interference on the game but get the right decisions to have the maximum impact".
"That (1minute 25seconds) is a little bit longer than we have done in training", said Riley. "The VAR would have pulled me back if it was ..."
The FA plans to trial VAR - which is already being used in the Bundesliga, Serie A and Major League Soccer - in each round of the FA Cup ahead of a potential wider introduction in English football.