Ken Shapiro, a former child television actor whose hit 1974 film, “The Groove Tube,” anticipated “Saturday Night Live” by a year with sketches that wickedly satirized TV, died on Nov. 18 at his home in Las Cruces, N.M. He was 75. His daughter, Rosy Rosenkrantz, said the cause was cancer. Mr. Shapiro’s film, with a cast that included Chevy Chase, a future “S.N.L.” star, and the comedian Richard Belzer, was simultaneously inspired by Sid Caesar and Ernie Kovacs’s TV comedy shows of the 1950s and invigorated by the nudity, profanity and raunchiness commonplace in 1970s movies.