Revealing mistake: There is a British pilot who tries to pull rank in order to chat up Erik's sister. He has a hook for a hand, but the arm isn't any shorter. He is holding onto the hook under his cuff.
Revealing mistake: During the cockpit scenes there are no tail planes visible at the back of the planes.
Revealing mistake: in the scene where Flight Lt Gillibrand (the Australian) is making his practice bombing run there is a shot of him in the cockpit with the camera pointing in his face. He is shown turning the control wheel hard to his right. But the rear screen projection shows a slight left bank.
Revealing mistake: In one shot, approximately just at the beginning of the actual attack, it shows a Mossie banking hard left at about 80° - the view is from the front. From the left wingtip, a "line" is shown continuing the dihedral angle to the edge of the frame. This is obviously a pair of control lines - so indicates it is a model being flown.