In Casemiro's final game at Old Trafford, Luke Shaw opened the scoring with a cultured strike inside five minutes before Morato scored his first goal for Nottingham Forest shortly after half-time.
It wasn't long until United were back in front, though, as Matheus Cunha scored in the most controversial circumstances.
Bryan Mbeumo appeared to handle the ball in the box before seeing his deflected shot drop at the feet of Cunha, who calmly slotted his effort into the bottom right corner.
VAR reviewed the decision and suggested to the referee Salisbury, that it should be disallowed; however, he went against the decision, telling fans inside Old Trafford that it wasn't a "deliberate" handball as it came off his hip first.
Speaking live on Sky Sports commentary, Neville was in disbelief at the call to award a goal, labelling referee Salisbury as "ridiculous".
"Honestly, that is ridiculous," Neville said. "The VAR has been clear: the player has handballed it. He looked it for three minutes and the referee has looked at it for another minute.
"I can't believe what I have just seen. That was handball. I don't know what to say."
Forest were knocked out of their stride after that moment, but United didn't care as they profited from it.