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The title of the film comes from the French idiom "faire les quatre cents coups", meaning "to raise hell".

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All spoken lines in the film are dubbed over again by the actors themselves, save for a few minor and trivial parts. For instance, during the last scene, the sound of Antoine's footsteps was added during editing - the truck that the camera rested upon produced too much noise. Shooting on the streets of Paris, as many films of the French New Wave did, was often hectic and re-dubbing everything allowed François Truffaut to not have to worry about lugging bulky and expensive sound equipment around, and more importantly he would not have to worry about a street scene having too much background noise. This made shooting faster and easier.

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The English title of the movie "400 Blows" is a gross misinterpretation of the original title. The Finnish and Swedish translations of the title, roughly translatable to "400 practical jokes" are closer to the original meaning, albeit not perfect. The Swedish title: "De 400 slagen" means "The 400 blows" and make no sense. The original title stems from the French expression "Faire les quatre cents coups", meaning "to live a wild life", as the main character does. Literal translation of the expression would be "to do the 400 dirty tricks".

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The poem written on the board is 'Épitaphe Pour Un Lièvre' by Jean Richepin. It is an Alexandrine poem i.e. comprised of lines of twelve syllables, typical of modern French poetry.

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When Antoine's father finally nodded to the cinema business, realizing it is Rivette's "Paris nous appartient", he said: "Si c'est un complot..." And a 'complot' (conspiracy), really, is the central issue of the Rivette's film.

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François Truffaut's first film to be released on the Blu-Ray Disc format.

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Director Cameo