Your French title for AHDN is nonsensical, it should be "La nuit d'une dure journée". And the one for Let It Be is perhaps too literal, I would suggest "Qu'il en soit ainsi", but in that case I'd understand if it makes the quiz too difficult
Accept "octopus garden" for "octopus' garden"? I'm sure I've seen a few style guides that suggest just an apostrophe for possessive after *all* word-final s-es, not just plurals.
Some fun ones in here; titles like "Conduis ma voiture" just have a funny ring to them. Just goes to show that the songs wouldn't have the same vibe if their names were in French.
Enjoyed the quiz.
For french being my second language and me not knowing any of the Beatles songs, I ain't complaining