Character mistake: Many windows only have 1 or 2 panes taped over to prevent glass from shattering when it's hit. Unless every pane is taped over this will achieve next to nothing.
Battle of Britain (1969)
1 character mistake
Directed by: Guy Hamilton
Starring: Michael Caine, Trevor Howard, Harry Andrews, Curd Jürgens
Factual error: The door of the garage next to the house is of the aluminum up-and-over type, not available until the late 1960's.
Warr. Off. Warrick: Put that cigarette out! The mains have gone, can't you smell gas?
Section Officer Maggie Harvey: Don't you yell at me, MR Warrick.
Trivia: During the Stuka attack on the radar station, the two Stuka radio controlled models that collide was a complete accident. It looked good so was left in the final version.
Question: Did Sgt. Pilot Andy loot the mantle clock he can be seen carrying when he is returning from helping to rescue bomb victims, to the refuge shelter?