Mauricio Pochettino felt sympathy towards Watford following confusion over the outcome of a VAR check for Tottenham's late equaliser on Saturday.
The Premier League's bottom club led 1-0 away at Tottenham Hotspur Stadium for much of the contest following Abdoulaye Doucoure's sixth-minute strike.
Watford also had a strong appeal for a penalty dismissed following a review – Gerard Deulofeu going down following a sliding challenge from Jan Vertonghen – before Spurs levelled in the closing stages.
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Dele Alli capitalised on a collision between visiting goalkeeper Ben Foster and substitute Kiko Femenia, though VAR was required to see if the scorer had used his arm to control the ball before finishing with his left foot.