Revealing mistake: When Keung hits the mobster in the face with the football helmet, you can see his bruise appear a split second prior to contact. You can see it better in slow-mo.
Factual error: When the hovercraft is stopped after Jackie cuts the side open, it isn't slanted to one side(from the outside view), it is straight.
Suggested correction: It is slightly slanted... it's just hard to see with the camera angles, since it's mostly shot from the side once it crashes.