In the 84th minute, the Old Trafford faithful stood and applauded off their departing legend, as Carrick left the pitch for one final time.
Sergio Romero had been a spectator for most of the first half but his concentration was tested just before the interval and the Argentinian certainly stood up to the task.
Carrick played his last game for the club in the win against the Hornets and is set to take up a role in Mourinho's backroom staff.
Carrick's first intervention was to slide in on Roberto Pereyra but he was left flailing as the visiting midfielder evaded the challenge and Watford turned defence into attack.
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He saw last seen on Clover Hill Drive, where witnesses saw him being pulled into a auto with the possible registration 760 TNH. He said a member of the public called police after seeing media reports and recognised the vehicle.
"So there was a period where he was so, so important but he couldn't have the continuity of the fantastic player he was for the club".
Even at the age of 36, the Englishman was unflustered in possession, recycling the ball and spreading play easily.
"I have a lot of memories to cherish, some I'll never forget, especially of this place".
Mourinho had a lovely message for his old friend before the game, wishing him the best of luck, expressing his gratitude and admiration for a man he regarded as a student and confidante.
Portuguese Faria has worked with United manager Jose Mourinho since 2001 and they have won 25 trophies together with six clubs. We will see, ' added Mourinho.
Watford's form has dropped off a cliff over the tail-end of the season.
English Premier League match report Manchester United v Watford 13 May 2018
Mourinho insists Carrick will not immediately step into the role but hinted he could make another addition to his coaching team. His spotting of Mata's run beyond the Watford defence, combined with the execution of his pass, was sublime.
End of Martial at United?
Yet there was no Anthony Martial in the squad, despite Mourinho's prior indication the Frenchman would start.
Next came a moment that summed up United's season.
Faria will hope to go out with a bang in Saturday's FA Cup final against Chelsea.
Rashford's goal will at least have done his Wembley prospects no harm, particularly with the fitness of Romelu Lukaku still uncertain.
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But critics are disappointed money is being used in this way while there are claims the state system is at "breaking point". These plans are a shadow of Theresa May's original vision, but they achieve much of what Justine Greening wanted to do.