In Airplane! (1980), the voice actors for the airport announcers Betty and Vernon, the couple who argue about the red and white zones over the intercom were in fact a real-life married couple who made the intercom announcements at LAX Airport at the time.
Posted by u/VictorBlimpmuscle in r/MovieDetails

The singing nun in Airplane! (1980) is played by Maureen McGovern, who sang the well known songs from several disaster films of the 1970's including The Morning After from The Poseidon Adventure (1972) and The Towering Inferno (1974). Airplane! itself parodies a film in the genre, Airport (1970).
Posted by u/MCofPort in r/MovieDetails

Hostel 1&2 (2005, 2007) feature cameos from two Exploitation Cinema directors. Tikashi Miike, known for Audition (1999) & Ruggero Deodato, known for Cannibal Holocaust (1980), both cast appropriately as rich psychopaths, with Ruggero fittingly playing a cannibal & Miike just playing himself.
Posted by u/Valert1 in r/MovieDetails