The 1983 Orion Pictures remake of "Breathless" with Richard Gere and Valerie Kaprisky has several scenes shot inside the California Theatre. We get a glimpse of the back of the auditorium, spend some time making love on a pile of curtains backstage while "Gun Crazy"(1949) is playing and get this glimpse of the exterior.
Thanks to Chas Demster for the screenshot. It appears on his post about "Breathless" on his Filming Locations of Chicago and Los Angeles blog where he also has photos of many of the film's other locations.
The theatre, at 810 S. Main St., opened in 1918 with 2,000 seats. Sadly, it was demolished in 1989 after a lengthy preservation battle. See our California Theatre page for a history of the building and many photos.
On IMDb: "Breathless"