Danny Simpson's challenge on Javier Hernandez saw referee Lee Probert book the Mexican for diving.
Sir Alex Ferguson: "It was a clear penalty. It's an insult because he's booked him.
"I thought the referee had a good game tonight, but he's let himself down by booking the player.
"If it's not a penalty, fine, but to book him is an insult. There is definitely contact, no doubt about that."
Alan Pardew: "My heart sank because I thought the ref had given it.
"The history of Manchester United - last-minute goals, the club that they are, the manager that they have, I honestly thought the referee had given it.
"You have to applaud him for the decision he made because it was the correct decision.
"Danny stuck a leg out, if I am honest, but just retrieved it back in and Hernandez went over.
"He took that opportunity and in the last minute, I don't criticise him for that - I might have done it myself - but the referee got the decision right and we got, in my opinion, a deserved draw."