portrayal of the FBI. Evans refused, but when pressured by his studio, he changed the "FBI" to "FBR", and "CIA" to "CEA" by redubbing the voice track slightly out of sync. Evans believed that his telephone was monitored by the FBI (or the phone company) from that point on. The film's opening credits include a disclaimer that it was made without cooperation from the FBI or CIA.

The musical band of hippies led by McGuire was a Los Angeles rock group called Clear Light.