When Claude Véga appears, he impersonates Delphine Seyrig and quotes a line from Last Year at Marienbad (1961). He also quotes from a line that Seyrig spoke in the previous Antoine Doinel film, Stolen Kisses (1968).
Last Year at Marienbad (1961) is not the only film to get a tribute in this movie. When Antoine Doinel is walking in a street, a big ad of John Ford's "Les Cheyennes" (Cheyenne Autumn (1964)) is seen behind him. Also, when Doinel is at a train station, Jacques Tati (in fact, someone impersonating him) shows up and offers some seconds of his unmistakable marvelous humor.
Antoine Doinel (Jean-Pierre Léaud) makes a phone call at a pay phone and asks to speak to someone named Eustache. When Eustache comes to the phone, Antoine calls him Jean. Jean Eustache would direct Leaud in The Mother and the Whore (1973) the next year.
One of the composer portraits decorating the Doinels' front room is actually a portrait of the actor Oskar Werner dressed as Wolfgang Amadeus Mozart for a play. François Truffaut directed Werner in two films, Jules and Jim (1962) and Fahrenheit 451 (1966).
Antoine Doinel works as an operator of remote controlled boat models. Very similar jobs appear in two other films by François Truffaut: The Man Who Loved Women (1977) and The Woman Next Door (1981).