Managers Pep Guardiola and Sean Dyche experienced differing emotions at Goodison Park on Wednesday - but both left the ground questioning the laws of football.
Manchester City defender John Stones limped off with an ankle injury after the assistant referee had kept his flag down as Beto ran through on goal despite being offside.
And then, in the second half, Everton felt harshly done by after seeing a penalty awarded against them for Amadou Onana's handball from Nathan Ake's shot.
It allowed Julian Alvarez to convert from the spot, with goals from Phil Foden and Bernardo Silva either side giving the visitors a 3-1 victory.