Arsene Wenger secured his first victory over Jose Mourinho in the Premier League with Granit Xhaka and Danny Welbeck securing victory with second-half goals.
But while the match was unfolding on the pitch, all manner of entertaining things were going unnoticed.
Sportsmail was keeping an eye out to bring you the best of the action both at the Emirates and on social media...
More pre-game protests from the Arsenal fans
A few would surely have been won over by an important win over Manchester United, but before the game a minority of supporters reiterated their dissatisfaction with Wenger's continued presence at the club.