The Abominable Dr. Phibes (1971) - Newspaper Ad [Oakland Tribune - July 7, 1971]

According to the venue listing at the bottom of this ad, the Coliseum Drive-In seems to have had only two screens at one point. I am going to guess that the third screen, which I will assume would be the one that had its back to 880 (aka the Nimitz Freeway) was added at some point in the mid-seventies. Because I remember the Coliseum Drive-In having three screens in 1976.