Peter Boyle receives first billing and Bill Murray receives second billing during the opening credits but dvd and video covers, movie posters and promotional materials tend to actually reverse the billing and feature Murray with above-the -title top billing with Boyle getting second.
To get into character, Bill Murray spent time with Hunter S. Thompson by drinking, shooting and generally having a great time at Thompson's Colorado ranch. After filming ended, Murray continued to act "Gonzo" through the beginning of the next season of Saturday Night Live (1975), to the annoyance and consternation of cast and crew members.
The dwarf in the hotel scene, Briggs, is the same dwarf in the Beverly Heights Hotel lounge scene in the later Hunter S. Thompson movie Fear and Loathing in Las Vegas (1998) that brings Duke the phone.
In the bathroom scene when Murray is washing his shoes out in the sink, then hits them repeatedly against the urinal to get the excess water out, he is wearing glasses but his reflection in the mirror behind the urinals isn't.
The plane of journalists following the 1972 campaign sports an Evergreen International label. Evergreen International Airlines was a cargo airline formed in November 1975.
Dr. Hunter S. Thompson: You couldn't invent someone like Carl Lazlo. He was a... he was one of a kind. He was a mutant. A real heavyweight water buffalo type... who could chew his way through a concrete wall and spit out the other side covered with lime and chalk and look good in doing it.