As someone studying classical singing, I've become extremely bothered by the way Broadway people sing "you." Like "yew." There are very few Broadway people who don't do it (an example of someone who doesn't is Rebecca Luker.) The worst offender IMO is Norbert Leo Butz; in The Last Five Years it really is noticeable. But again, that "you" is more of a classical thing. It's just something that's started to drive me nuts.
The "When I look atchu" thing is an attempt at the French accent, I think... it's always bothered me how Marguerite has a French accent but Armand doesn't, btw.
Anyway...
Evita London Revival has MANY offenses. "You let down your people, Eviter" being the one that stands in my mind.
Jimmy, what are you doing here in the middle of the night? It's almost 9 PM!