* AuthorExistenceFailure: Not Lynch, but original cinematographer Herb Cardwell died midway into the production under mysterious circumstances.
* DevelopmentHell: Due to troubles with funding and cast availability, this movie took five ''years'' to film. There's a scene where Henry walks through a door; his entering and exiting the door were shot a year apart.
* DyeingForYourArt: Jack Nance had to keep his famous haircut throughout production, essentially through the early half of the seventies.
* HeyItsThatGuy: Paul is [[Film/AssaultOnPrecinct131976 Napoleon Wilson]].
** Henry Spencer is [[Series/TwinPeaks Pete Martell]].
* NoBudget: The film was made on a budget of $20,000.
* ShrugOfGod: Lynch refuses to offer any clues for authorial intent, and pointedly refuses to discuss [[YouDoNOTWantToKnow how the baby was made]].