Continuity mistake: When Steiner lifts up the Jewish girl, if you look closely, you can see the rear end of the train about 20 metres away. Yet somehow Steiner has time to ask her name, wish her good luck, set her down on one of the carriages and watch her get shot before the train fully passes him. The departing train also conveniently slows down for him to drop the girl.
Continuity mistake: After Donald Sutherland parachutes into England, he walks across a cow paddock towards a gate. As he climbs over the gate, you can see there are no cows to the left of him along the fence but in the very next shot, you can see a line of cows along the fence which weren't there in the previous shot.