Theo Walcott appeared to be in an offside position for the Toffees first goal and Yerry Mina might have been show a second yellow
Watford head coach Javi Gracia joined the growing call for VAR to be introduced in the Premier League after seeing his side denied victory in a 2-2 draw at Everton.
Some key decisions went against Watford in Monday's clash as Everton star Richarlison scored a controversial opener against his former club, converting after Theo Walcott had touched the ball in an offside position in the build-up.
Everton defender Yerry Mina also avoided a second booking for a coming together with Isaac Success at Goodison Park.