#3 Solskjaer uses his predecessor's formula with better results
Jose Mourinho often used the same gameplan in the big games. He aimed to be organised at the back, and deployed pacy attackers to expose the opponents on the counter-attack. Solskjaer did the same against the Spurs, and it worked like a charm.
He played Jesse Lingard as a 'false nine', flanked by speedsters Marcus Rashford and Anthony Martial on either side. The goal came as a result of this, when Rashford hared into the right channel and Pogba found him delightfully. United had just 39% possession in the game, but they were happy to see less of the ball.
Mourinho was often criticised for adopting such an approach, due to the boring nature of it. But the three points matter more than anything else, and Solskjaer achieved that here. He took a leaf out of his predecessor's book for that, and it worked quite well.