There's a quirk in the NFL system where most decisions can't be reviewed after the next play has started. My team the Bills 'hurried up' a number of times last year to avoid scrutiny of what they obviously considered a dubious prior play. That can't happen under VAR by rule, but there's another irritating thing that has crept into the game that would sort of prevent it anyway - the almost-extinction of the 'quick free-kick'. In NFL the attacking team doesn't have to wait for a whistle, in footy, although I don't believe there's a rule (MA please advise), teams looking to press on by taking a free kick quickly are almost always called back by referees if the kick is from a remotely 'dangerous' position. Another means of delaying the game and denying the fan of action/excitement