Man United held on to defeat West Brom and close the gap on Manchester City to 11 points at the top of the Premier League.
Romelu Lukaku and Jesse Lingard had put the Red Devils in charge, but Mourinho's men could not finish off the Baggies.
Gareth Barry prodded home from close range to halve the deficit and the Baggies rallied to give United a real scare.
Jay Rodriguez headed just wide after Phil Jones lost his man but United held on to secure the points and a second consecutive win since the defeat in the Manchester derby.
1. Man United win - but it’s so underwhelming
Believe it or not, Manchester United have made the best start to a season since Sir Alex Ferguson left Old Trafford.
However, United have been completely overwhelmed and overshadowed by Manchester City. They are second but second is nowhere if you are Jose Mourinho.
United fans expect big trophies and they want them with style. They are not going to get that this season.
2. Man United fans bite back
The away supporters gave us a chorus of “Park the bus, park the bus Man United, playing football the Mourinho way.”
It was a great way to respond to the dressing room taunts from Man City’s players after their win over Tottenham.
The fall-out from the Old Trafford tunnel bust-up continues, but while Jose Mourinho has sulked and come out of it badly, the United fans at least injected some humour.
3. Romelu Lukaku is a flat track bully
Lukaku scored his 15th goal of the season but did little to dispel the theory that he is a flat track bully.
The £75m striker drew a blank and got criticised for his performance against Manchester City last week and then scored against Bournemouth in midweek and broke the deadlock against West Brom.
Lukaku has not scored against any of United’s top six rivals this season and is struggling to shake off the accusation that he is not a big game player.
4. Alan Pardew has some serious work to do
West Brom started quite well, looked solid - and then collapsed all too easily.
Gareth Barry’s consolation was the first goal in Pardew’s first four games in charge, they are a team bereft of belief and the former Newcastle and Crystal Palace boss desperately needs to inject some of his own confidence into the players.
West Brom got better in the second half after Gareth Barry came on and they also went to a 4-4-2. Pardew will need every trick in the book to get out of trouble.
5. Burke must improve to keep place in team
Burke, 20, cost £15m and yet was making his first start for West Brom. Is there a place for a young, technical but inexperienced player in a struggling team? He did OK but found it hard to make an impact.
The young Scottish winger struggled at Red Bull Leipzig, returned to English football at the Hawthorns and yet we have seen little evidence of the skill to back up the hype he got at his first club, Nottingham Forest.
Burke provided one good cross but not too much else.