The yellow passenger jet at McCarran Airport is from the now-defunct airline Hughes Airwest, a.k.a. "The Flying Banana".
More than 8,000 rounds were used for the climactic shootout scene.
The police officers shooting at the bus in Downtown Phoenix were actual Active and Reserve Phoenix Police Officers.
The illustration on the film's original theatrical release poster was by Frank Frazetta.
The entrance to the Phoenix Police Department seen twice in the first few minutes of the film is actually Phoenix Symphony Hall. The word "Hall" can even be seen above the front doors.
Sam Peckinpah wanted to direct with Kris Kristofferson as the male lead. Walter Hill was also interested, and he too approached Kristofferson. Peckinpah and Kristofferson instead made Convoy (1978) with Ali MacGraw, whom Peckinpah considered as the female lead in The Gauntlet.