In the roadblock scene the platoon arrive in Jones' van, even though the platoon has only just been formed the van has the flaps for the guns to poke through which happens later in the film.
Jones is wearing a jacket at the meeting in the police station but as they leave to go to the church hall his jacket is missing. When they reach the church hall he is wearing it again
The steamroller is seen to drive over the same set of tents twice.
When the steam roller first drives over the laid-out equipment, it is moving in front of a line of men. However, in the shot showing Jones and Mainwaring trying to control the roller, there are no people evident beside the roller.
In the barricade scene, general views of the street in both directions show that it is empty of vehicles apart from Jones's van. But in a shot of Mainwaring and Wilson at the barricade with the street visible behind them, there are four (modern) cars.
Mainwaring, Wilson and Pike leave their bank during their working day to visit a local radio shop in order to listen to Anthony Eden, the Secretary of State for War, announcing the formation of the LDV, later called the Home Guard. Eden's announcement was actually broadcast in the evening, after bank employees would have finished work.
The film explicitly opens on Tuesday May 14th 1940 - Pike even updates the bank calendar - but Wilson's "Daily Express", which he's picked up from the newsagents, is dated Friday May 3 1940. (The headline of that day was actually completely different; likewise the headline shown for the Friday May 31st 1940 edition ("BRITISH ARMY RESCUED FROM DUNKIRK") should have been "TENS OF THOUSANDS SAFELY HOME ALREADY", though the rest of the front page is correct.)
When Mainwaring lines up the shotgun shells at the street barricade, the close-up reveals that the primers are all indented indicating the shells have already been fired.
In the rocket testing scene the platoon run into a barn for cover. The rocket is seen free falling nearly vertically from a great height. Yet when cutting to the shot of it hitting the barn it is flying horizontally just a few feet off the ground into the wall and now under power.
A policeman can be seen briefly in one scene, when the platoon march through Walmington High Street. The policeman is clearly there to stop traffic from using the road, while the scene for 'Dad's Army' is being filmed, the scene is when the platoon march through the High Street and Capt.Mainwaring says to them, "Splendid turn out men, to look at us, no one would think we've only been formed a few weeks."
The pontoon bridge in the manoeuvres is (occasionally, dependent on shot) carpeted. This was to assist Fullard's nervous horse negotiate it.
As the general is approaching the pontoon bridge for the first time, you can see his shadow behind him. As the day was overcast at the time of filming, it's obvious there is floodlight trained on the actor.
During the roadblock scene, cars contemporary with the year the film was made can be seen parked at the end of the street. The closest one is covered with a tarpaulin to disguise the fact it's "modern".
After Mainwaring, Wilson and Pike have left the Wireless Shop, camera trolley and crew visible in windows when they meet up with Jones.
During the march showing the men's change from 'civvies' through underwear to full uniform the shadow of the camera crew on a tower can be seen as the scene nears its end.
Given Walmington-on-Sea is a fairly small town, Mainwaring knows remarkably few of his fellow long-term residents and has to be introduced to them at the start of the film (in reality to present them to the audience). Notable in this is Frazer being introduced to him as the local undertaker - despite Mainwaring having already seen him in full funerary regalia earlier in the day.
During the initial meeting in the Church Hall which started at 6 pm, Godfrey tells Mainwaring that there is a message from his wife to bring back a pound of Brussels Sprouts. Shops in those days closed at 6 pm at the latest.
During the firing drill inside the armored van, Mainwaring states that the enemy has been spotted on the left. The men inside the van shout "Open two three. Out two three. Left two three" and proceed to point their rifles to the right instead.
Whilst in the radio shop Mainwaring starts to get annoyed when the radio does not start immediately it is turned on and is told that it has to warm up, this is for our benefit as obviously they don't any more, however Mainwaring would already know this as he would not know anything else.
During the stand off in the church hall at the end of the film with Mainwaring, The German Airman pronounces the letter W in words as if he is a native English speaker and not German.
The letter W in German is pronounced as a V and there is no English W equivalent in German.
Where he says "I give you one last warning", it should have sounded like "I give you von (for one) last varning"
The German Airman at the end pronounced the letter W in words incorrectly and as if hes English.
The sound of a W for a German speaker is similar to a V as there is no equivalent to W in German.
Where he says "I give you one last warning", it should have sounded like "I give you von (for one) last varning"