@ 12:40, an officer approaches two airmen on the taxiway, and they salute. One is not wearing any head-dress, so would absolutely not salute, but would come to attention instead. The salute given was also wrong: palm down (as in the Royal Navy) rather than palm forward.
At about 22.22 the voice-over in the briefing huts states the approach will be made to the target at 450 km/h but the RAF has always used knots, not km/h. As noted in earlier scenes, the pilot in this scene has no rank markings on his uniform.
The Mosquito aircraft in the film have the squadron code GB, however the only Mosquito unit to use these codes was 105 Squadron which operated B.lV and later B.lX bomber variants of the aircraft, and did not participate in the raid. The aircraft in the film are FB.Vl aircraft which is correct for the aircraft actually in the raid.
The RAF Uniforms are incorrect: the Officer, who is wearing a greatcoat, does not have any rank insignia on his shoulders (which was where the insignia was worn), and the pilots, who would have been, at least, Sergeants, have no rank insignia on their battledress jackets; they also have brass buttons on the shoulder straps of their jackets which should be black plastic.
In the English translation, during her meeting with Teresa, Prioress mentions not being 15th Century (1600s) Jesuits. The Protestant Reformation and it's subsequent Counter-Reformation didn't begin until the 16th Century (1500s). In fact, the Jesuits were founded in 1540, in Paris.
At the end, when leaving the Theatre to check to see if Eva is home, the mother leaves Right out of the theatre door, turns right, so is then BEHIND the theatre--instead of just going left, but then makes FOUR MORE RIGHTS which would have her going in the opposite direction, looping over where she was and back past the school, in a circle. Really weird choice of making her turn that way 5 times, instead of just showing some of that anxious run home and editing out the turns.