Tunnel Vision is a 1976 movie that tried to predict what television would be like in 1985. It also laid the groundwork for the humor of early Saturday Night Live.
Basically, it’s a sketch comedy movie that features cameos from such future comedy stars before they were famous: John Candy, Chevy Chase, Joe Flaherty, Laraine Newman, and Al Franken.
Much like SCTV, the movie follows a typical day's programming on the network - while the president of Tunnel Vision has to defend his network in front of a Senate sub-committee.