We don't honestly think that ESPN believes Real Madrid and Barcelona's crests represent Manchester United -- this was clearly just a humorous mix-up -- and one that Wolverhampton (and maybe Man United?) will readily welcome.
It's also business as usual following its similar mix-up between Cristiano Ronaldo and Retired Ronaldo, Ashley Young and Paul Scholes, the "Word Cup," and, of course, the time they thought our fake Messi quotes were real (and ran them without crediting the source).
We all make mistakes (I make a lot of them), but it does seem its television graphics department makes more in relation to the world's game than, say, any other sport it broadcasts. Anyway, that Clasico between Man United and Wolves on Saturday will be a must watch.
Screencap thanks to @jimmy_westside