I saw it today. Although I find not addressing why Oz wasn't there, it makes sense that after about 3 years they would've gotten used to it by then.
Anyway, here in Canada, it's rated 14-A, so my little brother got to see it with us.
I also heard that they were supposed to have Stifler's dad getting back together with his mom. But I still liked that whole part when Finch sees her out of the corner of his eye and walks up to her while she's keeping a "low profile" while they go upstairs to her suite while those other two guys see her taking a bath... with Finch.