There's one thing I didn't quite understand in this episode (ah! ONE thing only, right...), regarding Lenny. So, according to David's ex-girlfriend, Lenny is actually Benny, a guy. But Syd and David were both at the mental hospital and Lenny was also there, right? Syd knew about Lenny... Heck, didn't Syd even kill Lenny by having her "nicely" framed inside a wall after Syd changed bodies/souls/whatever with David? If this is all correct, then why didn't Syd show herself to be more surprised after the revelation that Lenny was actually a guy named Benny and not the woman she framed on the wall?
I'm guessing the real question here is: what did I miss?