Revealing mistake: When being chased down the street and Jackie is in the horse carriage, he throws a guy through a window. You can see the glass has been pre shattered and therefore easier to break.
Revealing mistake: When Jackie Chan is water skiing with his sneakers on, you can see that the shoes are huge and square shaped to help him slide.
Answer: Yes. His name is Emil Chau. http://www.imdb.com/name/nm0154235/. Such questions can usually be answered using The Internet Movie Database http://www.imdb.com.