- The film was banned in the UK, because the censors considered it to be an advertisement for LSD. In 2003, the BBFC revised the decision and granted the film an 18 certificate.
- Some of the music was provided by the group, The Electric Flag.
- In order to prepare for the film, Peter Fonda, Dennis Hopper, Bruce Dern and Jack Nicholson all engaged in a group LSD trip.
- Jack Nicholson wrote this screenplay for Corman based on his own experience of taking LSD under controlled laboratory conditions and also on his marriage break-up with first wife, Sandra Knight.
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