Great show. REf. post above concerning Stevie Wonder music at reception. Not sure of all the tunes, but the ones I recall were "I Wish" and "Isn't She Lovely." I thought it rather odd too.
Here is my prediction. It's not a spoiler because I have no inside information, it's just my feeling. Who knows, maybe the writers are trying to mislead us, but if you don't like to speculate don't read.
Click to see Spoiler:I think that Karl, (Pam's husband) is going to snap and try to kill Bill. Remember how all season, he's been depressed. He got upset with Bill when protestors, trashed his yard, then Margene came between he and his wife, then they showed him looking at the wedding guests arriving next door, while he's all depressed about being unemployed. I think they are building him up to snap.
Oh, what was Bill's best friend (can't recall his name, he runs Home Plus) looking so concerned about at the wedding? Do you think the police had already talked to him and he didn't tell Bill because he wanted to avoid ruining his wedding? He looked so uncomfortable, like he was in pain. PLus his son came up with a reason that he could not attend the wedding. No one said why. Hmmmmm.