Which probably stemmed from the assumption that the princess in SML and SMB were the same person. I think the only really explainable change would be Birdo (got his operation).
Ian: The MKDD manual also complains that having the baby Bros. and the Bros. in one game makes no sense, but who cares when it means "chain chomp time"?
RAB: Then DK must've aged pretty fast, Mario didn't get any older between DK and SMB (well, okay, he changed lovers and his profession). nless it's some Peter Pan style wonderland Mario should've aged as well. Well, if anyone gave a damn about consistency in Mario games. As Miyamoto said, "We make a game, when we're done with the game itself we make up a story that somehow fits with the game" (or was it Aonuma? Either way, it was in regards to Wind Waker, after admitting they've scrapped a much more elaborate story on Miyamoto's order because they feared it would be too compex).