Visible crew/equipment: When Jackie Chan is standing on top of the tower, and shouts "Who am I?", the camera starts to circle around him. When it does this, you can clearly see a guy in a white shirt standing underneath, and then hides away in the corner! It's really clear to see.
Visible crew/equipment: When the lab where the scientists are starts to blow up, if you watch closely on the table where the scientists are running from, you'll see a pipe which is blowing out sparks into the air to make it look like it is blowing up!