- After "Incubus" generated acclaim in film festivals around the world and in successful theatrical showings in France, a lab mistakenly destroyed the negative and all prints. "Incubus" was lost, and was never released on video. Then, after years of searching, one print was discovered in the permanent collection of the Cinematheque Francaise in Paris. From that sole surviving print, "Incubus" has been digitally restored with remastered sound.
- All the spoken dialogue was in Esperanto (to date , the only such American film).
- Just one year after this film came out, as its prints were being destroyed, William Shatner was cast in "Star Trek" (1966), cinematographer Conrad L. Hall got his first Academy Award nomination, actor Milos Milos killed 'Rooney, Mickey' 's ex-wife and then killed himself, and actress Ann Atmar committed suicide.
- In Esperanto, an Incubus (a male demon who seduces women) is "inkubo" (een-KOO-bo). But when Arndis says she's had a nightmare, nightmare in Esperanto is also "inkubo", or preferably "inkubsong^o" (een-koob-SON-jo).
- Shatner grew up in Montreal, Canada, and probably because of this he keeps pronouncing certain Esperanto words as if they were like French. Listen for him saying "sen" (without) pronounced as if it were French "sans", or "sento" (feel) as if it were French "sentir" (to feel). For the record, Esperanto has no nasal vowel-sounds like French does.
- Reuses music from "The Outer Limits" episode "Nightmare".
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