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.
Factual error: The naval captain in this episode has a military mustache as prescribed by army regulations. The Royal Navy regulations, however, prohibited separate mustaches and beards - if facial hair was worn, a "full set" of beard and mustache with the beard joined to the mustache was mandatory, and that to be grown to the commanding officer's satisfaction within six weeks.
Factual error: Foyle is subordinate to an Assistant Commissioner of the Metropolitan Police, but Hastings had its own force (merged with other Sussex forces 1943-47) and the Met had no jurisdiction outside London.
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.
Factual error: The American flag shown has 50 stars, not the 48 stars that were on the flag at that time.
Factual error: While this episode is set in 1946, early in the London street scenes a red Routemaster bus is prominently featured. The first of these buses was not delivered to London Transport until 1956.
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)
Factual error: A sign says "REMEMBER THE ENEMY IS LISTENING" in Chicago typeface, but this font wasn't invented until 1984. (01:15:50)
Fifty Ships - S2-E1
Factual error: In the scene when Foyle meets the Home Guard colonel, Letwin, the colonel, has his Sam Browne belt slung over his left shoulder which is totally wrong, especially for an officer risen to field rank. Apart from being intended to provide support for the officer's sword (even if not worn and even if his service revolver is likely to induce sagging), the belt slung over the left shoulder will obscure medal ribbons. Horror of horrors.
Factual error: The episode takes place in 1946. Numerous scenes are shown in which the public buildings are clean. In 1946 they were soot streaked and grimy black and white from generations of coal fires and pollution. In addition one street scene has a street sign on a pole with a modern graphical notice on it rather than a worded notice of the time. Also, in the same scene the street name plate has a rather updated type face.
Factual error: Foyle's son is assigned to be a target for radar tracking, and he is assigned a Spitfire. However, the aircraft depicted is a four-bladed model, which didn't exist in 1940.
Factual error: Sergeant Brooks calls Det Sgt Milner "Sir" but they are of equal rank.
Factual error: The episode is in May 1940. The ship in the photo that causes the arrest of Thomas Kramer is a King George V class battleship. The lead ship of the class was commissioned 11 Dec 1940.
Continuity mistake: In the final scene when Miss Pierce in a car asks Foyle to get in, she looks rather more presentable initially with her hair in curls partly framing her face, with noticeable red lipstick and possibly make up. When Foyle gets in the car and takes up the conversation, the hairstyle reverts to her usual dowdy plain style off the face and the lips are natural.
Factual error: A number of the cars have number plates in which the numbers precede the letters, whereas at the time the letters came first.
Factual error: In this episode - in 1942 - streptomycin is used to cure anthrax infection. But streptomycin was first isolated in 1943, and first used successfully - on Sen. Bob Dole - in 1946.
Broken Souls - S6-E2
Character mistake: At the very end of the episode, a chess board is set up wrong, the initial position must have the white queen on the white square (d1) and the black queen on the black (in this case red) square (d8). They set up all the other pieces correctly except the kings and queens should be reversed.
Factual error: SS officers did not carry a unit identification tattoo on the forearm, as implied in this episode. Most (but not all) carried a small, black, blood group tattoo under the armpit.
Factual error: Foyle is a Chief Superintendent. But the series is set during the Second World War and the rank was not introduced until 1949.
Factual error: In the sequence where Michael runs over the innkeeper Judd, the car which comes up behind Judd has very bright headlights with the characteristic three spokes towards the centre. At that time, all cars had to have masked headlights as could be seen elsewhere, including on the earlier shots of the green SS Jaguar outside the pub in daylight. Also, when the car lights are first switched on, it looks as if the later Hartley (louvered) masks were used rather than the early hooded type.
Answer: He doesn't actually wear it all the time even in summer. In some episodes in the summer he simply wears his suit with jacket.