The Premier League outfit were fined €15,000 by UEFA after arriving late to their continental clash with Valencia on October 2.
In an effort to avoid a repeat of that situation, United tweaked their pre-match plans by moving their overnight accommodation from The Lowry to the Hilton Garden, which is less than half a mile from Old Trafford.
United were, however, to endure more travel chaos on Tuesday, with a coach carrying playing and coaching staff taking over an hour to make its way through congestion.
Mourinho, though, endured no such troubles as he took the decision to mingle with supporters making their way through the streets of Manchester.
The Portuguese told BT Sport on his journey: “As you know we changed hotel, the hotel is just around the corner. The players are in the bus for 45 minutes, and I walked, with a hoodie, in the middle of the fans, nobody recognised me.
“I took two minutes and what I did in two minutes the players... they cannot do 45 minutes on the bus.
“Juventus is having the same kind of problem. I informed the UEFA delegate about the situation because we don't want to be punished again.”
United had been hoping to arrive at Old Trafford in plenty of time before a crunch continental clash with plenty riding on it and one which boasts a number of intriguing subplots.
Mourinho’s men were held to a goalless draw by Valencia in their last European outing, leaving them second in Group H behind Juve – who have taken maximum points from two games so far.
United could take top spot on Tuesday, but will need to keep a familiar face quiet in order to do that.
Cristiano Ronaldo will be back in familiar surroundings with the Bianconeri, with an iconic No. 7 from United’s past looking to put a serious dent in their Champions League ambitions of the present and future.
He found the target on his last visit to Old Trafford with Real Madrid and has started to find his form with Juve after getting off to a slow start following a stunning summer transfer.
The five-time Ballon d’Or winner is not the only man with ties to both clubs set to take to the field on midweek, though, with United boasting a player of their own who falls into the bracket.
Paul Pogba won four Serie A titles during a productive spell in Turin which preceded his return to Manchester in 2016 as part of a record-breaking £89 million transfer.