Revealing mistake: In several driving scenes, the cars are visibly higher than the rest of traffic. Obviously a flatbed truck was used instead of a trailer for the filming of the interior shots.
Revealing mistake: When Mr. Orange shoots Mr. Blonde in the warehouse, you can see that the rounds rolling down the ramp are blanks.
Revealing mistake: When Mr. White shoots the two cops inside their car and Mr. Orange watches the scene astonished, dummies replacing the cops are visible for half a second sitting inside the vehicle just before the windscreen gets hit by the bullets.
Answer: It's a way of lighting a zippo lighter. If you snap your fingers close to it, your middle finger will strike the wheel and light it.
Nick N.