Revealing mistake: When David pushes the pallets onto the car, it's obvious that there is no-one inside. Similarly, when he uses the forklift to pick up the car a few shots later, we see inside the car and there is only a badly constructed dummy-type object in the back seat, and no real people. Even if they had bent down, they should still be visible.
Continuity mistake: In the two early scenes when Shuji is talking with David in the back of the limo, it's clear that they are not driving past the same section of street when the camera angle changes. For example, the buildings change from shot to shot. Also watch when Shuji hands David the bottle of whiskey in the second scene - Shuji's hand moves down the bottle between shots.