Factual error: A sign says "REMEMBER THE ENEMY IS LISTENING" in Chicago typeface, but this font wasn't invented until 1984. (01:15:50)
Factual error: When Sam reads the newspaper, one article claims that 254 people were killed in a Paris air raid. This episode takes place in February 1941, when Paris was already occupied by the Germans, and England did not bomb Paris. Oddly enough, this same article appears in a previous episode.
Enemy Fire - S3-E2
Factual error: While repairing Mary Wrenn's lights Gordon Drake says "Someone fused the ring main with a 3 amp fuse." It was February 1941 but ring mains were not introduced until 1947. (00:14:50)
Enemy Fire - S3-E2
Continuity mistake: In episode 2-4 "The Funk Hole " which takes place in the fall of 1940, Andrew states to Sam that his mother died when he was eight years old. In this episode (Feb to June 1941), Foyle is looking at his wife's grave; it shows his mother died in 1932, which would have meant Andrew was born in 1924, and only 16 in 1940, far too young to be a Spitfire pilot. Also, his commanding officer states "the younger pilots look up to you, Andrew", before one of the "younger" pilots (age 19) is badly burned in a crash in Andrew's plane.
