Milner is shot in the left arm by a suspect resisting arrest. When Milner next appears, his arm is in a sling. After that scene and for the rest of the episode, he appears without the sling and with his arm working perfectly. Since the events of the episode are identified as taking place all within the first 22 days of June, leading up to the German invasion of the Soviet Union, which is announced at the episode's end, there would not have been enough time for him to make such a complete recovery.
At the start when Jack and Derek argue in the pub, Jack pulls a Luger pistol from his pocket with his right hand and points it at his friend. As he points the Luger you clearly hear the sound of hammer being cocked, yet the Luger uses an internal striker and has no hammer. The Luger also has a toggle action which would have required Jack to use his other hand to cock the pistol and chamber the round. However Jack draws the pistol and points it in one fluid motion so that cannot be the sound. Lastly taking off the safety would have been probably inaudible and at most would have not been more that a single simple click, not the hard to mistake sound of a hammer being cocked.
When the police ask Captain Hammond about the missing soldier, the Captain says that he's probably walking on the beach. The Captain makes several wisecracks, this is one of them. Everyone would be aware that all the beaches on the south coast of England were heavily mined and fenced off with barbed wire. Indeed, the barbed wire and warning signs appear several times during the series.
A pulse can be seen beating on the dead sapper's neck when Foyle and Milner are viewing the body.
The women who are supposed to be welding are just heating bits of metal with poorly adjusted oxy-torches.
A character is said to have come "from Cumbria". The county of "Cumbria" did not come into being until the 1st of April 1974 when the administration map of the counties of Great Britain were drastically changed. Before that date and certainly during the war anyone from what is today known as "Cumbria" would have come from "Cumberland", "Westmorland" or the "Furness area of Lancashire".
When Captain Hammond is calling his soldiers to deal with the bomb that has dropped at the shipyard, he calls out "Ernie, can you get the lads?" However, it has already been established that Ernie is completely deaf, and since Hammond was facing away from him and at some distance, Ernie could not have lip-read him. So why does Ernie react and obey the order?
Ernie was never shown to be completely deaf and such a statement is incorrect. Consider Sgt. Milner was invalided out of the military after losing his leg at Trondheim. If Ernie was deaf from the bomb blast incident he was involved with he too would have been invalided out of the army. Even if he was awaiting a medical discharge he would never have been kept on bomb disposal duties, where hearing is so important for listening for ticking fuses and hearing instructions from co-workers who are not visible to them for safety reasons, i.e. staying a safe distance away from UXBs while other team members work on them. Apart from the fact that he probably would not have had time to learn to lip read since his accident, even if he were an expert lip reader that would not have kept him in the army, especially in bomb disposal: and lastly when Captain Hammond is telling Foyle about Ernie's injury, he says that Ernie suffered damage to his ear drums not that Ernie is deaf. Thus such an assumption, that Ernie is completely deaf and unable to hear the Captains command, is erroneous.