Visible crew/equipment: As the Baroness is falling into the lake, there is a shot of her about 10m above it. The surface water looks like it is being blown by a helicopter. As soon as she is in the water, the lake is calm again.
Visible crew/equipment: Right when the doors open, you can see the pulley that's pulling the far door open.
Visible crew/equipment: In the scene where Chitty Chitty Bang Bang comes into the castle to rescue the family, the shot shows the car turning, but a pivot wheel under the car can be seen, and the actual tire while turning, does not match the radius of the turn nor the speed at which it should be rolling.
Visible crew/equipment: When Caractacus is being dragged across the ground by the rockets, the wire he is holding onto is visible.