To be fair it helps when your defence suddenly decides not to defend. For all three goals, actually.
Can hardly call anything he did last night a mistake though. And wasn't Van Persie's volley (I assume) right by the post, not the middle? You could say he shouldn't have been beaten at his near post, but the finish was pretty good.
He's had by far his worst season though, and when I pointed that out to a bunch of Liverpool fans was told to "c unt off"... whatever the hell that means.