The embroidered name in script letters on the jet pack flyer's coveralls "Kinnie Gibson" is usually covered by a circular patch for the "Stuntmens Association", but the patch is missing in an early flying scene, revealing the name of a movie stuntman who uses a compressed air jet pack.
When the car splits in half and the halves continue to drive, you can see additional wheels supporting them.
When Sam Hui is kicked in the chest in a nightclub, a protective lining can be seen under his jacket.