The American Friend (1977)
A lamp with a 'moving' picture of Buster Keaton's locomotive 'The General' is shown when Jonathan Zimmerman's son goes to sleep.
Ripley quotes from the song "Ballad of Easy Rider" from Easy Rider, a film that Hopper starred in and directed.
Photos from the film are shown.
A poster of this film is seen in a certain scene in "Barcelona".
poster is in Tommy's room
"The American Friend" is mentioned in an article.
When Moretti investigates the foot print in the snow he is humming the song "There's too much on my mind", exactly like Bruno Ganz is doing in "The American Friend"
Video case is shown ("El Amigo Americano").
A fragment of this film is shown in this episode
Talked about in film; video cover shown