Effetto notte

After the release of this film, Jean-Luc Godard sent François Truffaut a letter criticizing the way the film depicts filmmaking and called him a liar for it. Godard also criticized him for pandering to the mainstream, something they were both critical of filmmakers doing when they were critics at Cahiers du Cinema. Additionally, Godard went on to say that because the film was not truth and because the film was a hit, that they should make a film together about the filmmaking process; Truffaut would produce, Godard would direct, and they would co-write the script. Godard's return address was of Jacques Daniel-Norman, a virtually unknown filmmaker whose films were loved by Truffaut and Godard when they were film critics, hinting at a return to a simpler time. Ignoring this hint, Truffaut was insulted by the letter and responded by telling Godard that he is demeaning and pretentious and that he pretends to be poor, when in reality he was the wealthiest of their circle of friends. The response also included a line in which Truffaut flat out calls Godard a "shit". It is believed that this quarrel is what ended their lifelong friendship. Godard later regretted writing this letter, especially after Truffaut's early death in 1984 and went as far as to write a moving tribute to his former friend.

Several takes are wasted trying to get a cat to drink milk from a tray. Eventually Joelle brings in "the studio cat" to do the scene. But the cat that drinks the milk is actually a third, different cat.

This film is dedicated to Lillian Gish and Dorothy Gish.

Edited into Day for Night: A Conversation with Jaqueline Bisset (2003)