I gave this movie a 9 out of 10 SOLELY on the basis that I believe this is the Firesign Theatre's at their FUNNIEST and MOST ACCESSIBLE. The film itself is not all that great. As others have said, it's merely a lip-synch to the album (missing a scene or two and adding a bit of music). This movie is to the album what TV was to radio--certainly, the visuals were added, but what Stan Freberg called the "Theatre of the Mind" could always entertain from within in ways no picture could. The original album gets a 10, but knock it down a peg for the cinematic silliness. Find the CD (on laugh.com) instead and you'll see why these four (or five) funny guys, at their peak, were (and their old albums are still) the funniest thing going.
Review of Everything You Know Is Wrong
