There's no way anyone can prove Pogba tripped himself without the touch from Douglas Luiz, therefore because the ref gave the penalty - you can't say it should have been overturned. Had the ref not given the penalty, I still think it would have been given after review because it looks, from all angles, like Luiz inadvertently trips Pogba by pushing his foot behind his standing leg. It's soft but it's a foul. This one is the least contentious for me because we have seen a lot of these soft but 50/50 type calls long before VAR came along and will continue to see them given or not given.
The Maguire handball is lucky in that it's definitely accidental but his arm is away from his body and there's a real argument that he's altering the flight of the ball in a goal scoring situation. I am surprised that was not VAR reviewed pitch side although it would have been harsh (I am aware I am biased
).
The Mings elbow I originally thought was nothing but, when you look at it in slow mo, he is leading with his elbow into Pogba's face (and makes contact with his mouth). It's tough because he has to challenge and it's natural to lead with an arm, although not that high but I don't see why VAR didn't flag that to Oliver to watch pitch side as well.