at 20:41 (NTSC) the beginning of chapter 5, Nate Pope (Forest Whitaker) is an Amateur Radio operator with the call sign WB6QLF. QLF is amateur shorthand for "I am sending with my left foot", a reference to someone whose Morse Code sending skill is very bad. This is normally sent as a question "QLF?" meaning "Are you sending with your left foot?" to an operator who is very difficult to understand in Morse. WB6QLF is an actual call sign belonging to a Charles B. Roblin of Victorville. There is also a QSL card in the background with the call sign K6KAP. This is a real amateur ("ham") radio call sign that belongs to a Mach Myovich of Merced, California. Much of the radio equipment shown in the movie was purchased from the Ham Radio Outlet store that he was managing in Oakland, CA.
The main part of the movie was filmed in Old Town, Auburn, Ca. The Gas station was fake and built in front of the Post Office in town. The bar scenes were filmed in the old Shanghai, which is now Auburn Ale House. Robert Duval mooned John from the window of then, TSUDA's store. It is now Sierra Moon Goldsmith.