Despite the early setback, the Terriers were unbowed; most of the action in the following several minutes took place in United's box, including a first use of VAR to review a potential Chris Smalling handball.
United got off the ideal start by taking the lead after two minutes as Romelu Lukaku out-muscled his marker before firing home from close range. Because the referee wants to perform well.
"I think you are nice with your words, because when you say "a lot of speculation" you should say "a lot of lies", Mourinho told reporters on Friday.
He skilfully gathered the ball and rounded keeper Jonas Lossl before tapping into the open goal, only to see referee Kevin Friend seek clarification from VAR official Neil Swarbrick.
"At half-time I had to say 20 times to my analysts and assistants to shut up because I don't want the players to know what happened. I don't know. It was very tight, right?"
TWO CLINICAL strikes from Romelu Lukaku dashed Huddersfield Town's hopes of a second famous win over Manchester United in the space of the season - on a night when the controversial topic of video assistant referees (VAR) reared its head again.
The company remains adamant officials were given straight lines to make the offside call
"The decision went in our favor but this VAR for me kills the emotion of the game", Wagner said. "Nothing can make me lose that this season", he said.
But with Huddersfield struggling to mount a sustained assault on Sergio Romero in the United goal, Lukaku made the tie safe for the visitors by rounding off a 55th-minute counter-attacking move, which also involved Alexis Sanchez, by sprinting more than half the length of the pitch to score.
Mata looked to have doubled the advantage on 45 minutes before his goal was ruled out for offside by VAR, albeit with little conclusive evidence.
Brighton's Jurgen Locadia scored on his debut in the 3-1 win over Coventry City who, after knocking out Stoke City in the third round, failed in their attempt to make FA Cup history by becoming the first fourth-tier side to beat two top-flight teams in the same season.
"I don't know", said Mourinho when asked about the nature of Pogba's illness after Saturday's match. "It was hard but we started really well". I think it's needed, specifically when there is a clear decision that can change the game, like a goal, offside, red card, but hopefully it will be quicker.
Having agreed to coach United's U-23s with Warren Joyce, a few training sessions with the likes of Paul Pogba and Jesse Lingard reinvigorated a feeling that Scholes thought long gone.