You can see Jackie Chan's dental fillings during the peace pipe sequence. While metal ("amalgam") dental fillings existed as early as 1818, they weren't used in China, and Chan's character has never been out of that country before.
Well that is not really a slip up. I mean he had those in before the the movie and I don't think that it is something that you can fix once you have it in there (correct me if I'm wrong) so since it was something that couldn't be helped-I don't think that it can be considered a slip up. I think you are just being a little silly with that one.
hes not saying they put them there, but that they should have taken them out. which requires a video editor and an eraser tool. movie producers should have that.
i think thats being a little nit-picky. i suppose if they want to get REAL technical for the movie, Jackie Chan could have had the metal fillings removed and had the white filling put in (i had this done).