I have not seen this film since its cable run in the mid-1970s, but I still occasionally enjoy a private laugh when I think about it. The filmmakers clearly had a good eye for the details of small southern towns (the setting was Texas, but it would have been just fine for my native Tennessee). There is an early scene at a classic roller rink, where the dough-faced, slack-jawed teens used as extras were just perfect for the parts.
As mentioned by other reviewers, the movie-within-the-movie, DISASTER '76, is a solid parody worth watching just by itself. If a DVD is ever made (unlikely, I'm sure), DISASTER '76 should be included by itself as an extra.
7 out of 10.