Ah, the 8-track tape! I sometimes see them for sale in junk shops. There is such a sense of loneliness and isolation as he talks to himself, tears down the pin-up calendar, sits alone in a movie theater watching Woodstock and reciting the lines with the kid onscreen...
The Omega Man, based on Richard Matheson's novel I Am Legend, can legitimately be considered an SF Easter film. Its predominant themes of sin, deliverance, sacrifice and resurrection are high-minded and ambitious, as well as nicely balanced and executed. One of the film's neater ironies is Neville's twin aspects--destroyer and savior.
The New York Times has a review. So does Roger Ebert. Moria calls it "ham-fisted". 1000 Misspent Hours says it's "the only post-(man-made)-apocalyptic Christian allegory ever committed to film."