Thanks for starting this thread, kangaroos!
Actually there's one goof that kind of stuck in my head - it's when Stu has that heart attack Amy comes to visit him at the hospital and tells him he couldn't reach his mom because she was at a nursing home and suffering from Alzheimer. Later we see Concetta Tomei, the
Providence mom, playing Stu's mother, totally Alzheimer-free - and, sadly, without her usual blue-green costume.