Yeah, one of my few complaints about the movie is that the ending SREAMS "Oh, a sequal is coming".
I haven't seen any major reviews complaining about the accents, but I have seen people on message boards saying "Why are they playing baseball on the island" (It is cricket!!!) and "This movie had bad accents, it sucked", you just feel like going up and telling these people to learn about other cultures. (Especially if there gonna be the "World's policeman", and they can't find Iraq on the map.)