During the pursuit on the roofs after two Yamakasi steal the painting in the lady's apartment, their masks are repeatedly on and off between shots.
At around the 48th minute of the film, when there is a dog chase in the richly decorated house, two members of the crew are visible with their heads jumping out on each side of the screen.
(at around 1h 20 mins) You can see the boom mic as the doctor pulls away and aims the gun at everybody.