Goofs

Jose de Perez claims that the building in which he lives is 'Spanish soil'.

This is completely untrue. Foreign embassies have many privileges, but are never considered to be 'foreign soil'. Other of their owned buildings may be accorded some diplomatic status, but are not exempt from e..g police searches with a warrant.

Captain Boothroyd is a naval officer with a moustache. In the Royal Navy, officers were (and still are) allowed either to be clean-shaven or else to have a "full set" (beard and moustache). A moustache on its own is *not* permitted.

Two Naval officers speak to Foyle to get Evelyn Richards released due to her top secret work which turns out to be connected with the bouncing bomb. However the plan to attack the Ruhr dams was a purely RAF operation so it would have been RAF officers not Naval who sought the release of Evelyn.

Lydia takes her son to the beach, and later the three team-mates are standing by the sea. Surely during the war, beaches were off-limits to civilians? Especially somewhere as vulnerable as Hastings - they'd have been mined.

Foyle is allowed to see the experimental bomb. This constitutes a security breach beyond all reason.

When the two boys are sneaking up to the mansion to break in, the shadow of the boom mic is clearly visible on the bushes behind them.