Didn't watch the whole game so now clue about the overall performance but I thought a potential penalty missed late on...
www.bbc.co.uk
05:40 above for UK viewers.
As the ball lands at Cunha's feet I feel Saliba goes through the back of him - no contact with the ball, trips Cunha backwards - textbook careless for me. Is my threshold too low?
Fwiw I DON'T think VAR should recommend a review here

Man Utd 0-1 Arsenal: Gunners hold on to beat hosts after Bayindir error
Arsenal held on to beat Man Utd in their Premier League opener after goalkeeper Altay Bayindir gifted the Gunners the only goal of the game.

05:40 above for UK viewers.
As the ball lands at Cunha's feet I feel Saliba goes through the back of him - no contact with the ball, trips Cunha backwards - textbook careless for me. Is my threshold too low?
Fwiw I DON'T think VAR should recommend a review here