Robert Altman hated the script so much, he tossed it out and actors were coached on lines as they shot scenes.
A single 70mm print of the film was struck for its premiere in the Houston Astrodome to be shown in front of over 23,000 people. By all accounts, it was a disaster with terrible sound problems.
The original title of the film was "Brewster McCloud's Amazing, Sexy Flying Machine".
When Brewster and Suzanne are inside the Astroworld theme park, they enter the Lost World River Adventure. This particular theme ride was later renamed the River of No Return in 1976, and officially decommissioned in 1983. Astroworld, part of the Six Flags empire, was closed after 31 October 2005 and the entire park was razed in February 2006.
The movie premiere took place inside the Astrodome. Harris County Judge Roy Hofheinz, who controlled the Dome at that time, promoted the movie by trying to sell tickets for cars to drive in and watch the movie. Failing this, VIPs watched the movie from folding chairs on the field.