* ActingForTwo:
** Close attention to the closing credits reveals that the main cast appear as some of the caricature-voiced minor characters
** Also, Heather Chasen plays both lovely Wren Chasen and the appalling Mrs. Povey (as well as most of the female spies).
* TheDanza: All three of the central characters have the same names as the actors who played them.
* ExecutiveMeddling: It was decided halfway through the run that forces based humour had had its day and that the series would therefore be {{Retool}}ed to be set in a tv studio and called The TV Lark. A few episodes were recorded before sanity prevailed and the whole ghastly thing became CanonDiscontinuity. The official {{Retcon}} in the last episode of ''The TV Lark'' showed it to be a particularly ambitious scheme by CPO Pertwee.
* MissingEpisode: Several episodes were wiped and believed lost, but off-air recordings have been found of most of them, concluding with series 4's "The Cornish Exercise", recovered in 2022. All ''The Navy Lark'' episodes now exist, but Episode 9 of ''The TV Lark'', "The Top Secret Rocket Trials", is still missing.
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