"You have a duty to be ready whenever you are called upon. Bruno Fernandes and Marcus Rashford came on and did well," Solskjaer told BBC Sport.
"The goals were exceptional. Greenwood is a great finisher. We are just waiting for his season to get started but he is getting fitter. The first goal was top quality from Paul Pogba. I am so happy for him.
"We got away with poor performance. Away from home, we have the character and belief. To [come from behind and win] five times on the bounce is exceptional."
Visitors' equaliser ‘definitely out of play’ in the build-up, says Moyes
"The decision went against us and it seemed to floor us. The ball was over my head. I had the best view because I was right on the touchline," said Moyes.
"It was definitely over the line - you only need to look at the reaction of the players - they knew it went out as well. It changed the game."