When Tartu escapes from the plant, he gets into the getaway car from what should be the driver's side, and the steering wheel is on the right. Obviously, they were using an English car to film this scene.
Obvious models used to depict Stevenson's getaway car speeding away, then the plant's explosion.
Stevenson pointing the gun in the SS officer's back, then ushering him into the control cage is speeded up.
The poster warning the Czechs that they will be shot if they don't obey the curfew is in English.
The SS uniforms have the collar tabs reversed - the SS rune should be on the right and the rank insignia on the left.
When Maruschka is consoling Paula (after Paula had killed a German officer earlier in the day), Paula says, "But Karl got his revenge today, because I had Karl's own revolver...." In an earlier scene, however, Paula was hiding a semiautomatic pistol (presumably the murder weapon) and not a revolver.
The voice on the PA says "shoot on sight" and other commands in English to the SS chasing Stevenson through the plant's tunnels.