Plot hole: When Frank Martin steals the Mercedes, how does Lai manage to open the rear door, get in the back and hide - all with her hands bound behind an office chair? Not to mention actually closing the door and hiding herself (and the chair) in the rear footwell long enough for Frank to drive off and not notice her until they are out on the road. (00:29:25)
Plot hole: At the end of the film watch the people being released from the container very carefully. Despite being in the container for days on end, not one shields their eyes when exposed to natural sunlight. It would take several minutes for their eyes to readjust.
Plot hole: Inspector Tarconi visits Frank with suspicions, leaves, and only about 30 seconds later a rocket hits Frank's house with associated gunfire and more explosions. Tarconi can barely have made it to the end of the road, but somehow doesn't hear any of this going on.
Chosen answer: You notice that Frank removes those items from a bicycle frame. Those are stirrup-style rat trap bicycle pedals. They have serrated metallic edges which supposedly give Frank traction on the concrete floor, despite the oily mess.
Charles Austin Miller