Well-spotted, Southern!
I think it makes sense that Mike's not sure if he's made the right decision about marrying Susan...it's second time around with the same sappy woman - of course he'd be asking himself whether he wasn't being a leeettle stupid.
Wasn't convinced that they'd kill off MJ, though - DH and I decided in advance that that would be a step too far for a show like DH - it's dark, but not that dark. It would have traumatised all the viewers.
Dave - brilliant. Incredibly creepy. I do hope he's not like that in real life, I can't imagine him any other way!