Trivia: The couch gag in this episode shows the family in the style that Matt Groening drew them on the Simpsons on the Tracy Ullman Show.
Trivia: The cars in the Hollywood Car museum are the Munster Mobile, The Monkee Mobile, The Bat Mobile, The Flinstones' car, Herbie the Love Bug, The Dukes of Hazzard car, and The Road Warrior from Mad Max.
Answer: I'm not sure if this is the one you're thinking of, but an episode of "Ray Bradbury Theatre," called "A Sound of Thunder," dealt with a similar matter: a group of hunters travel back in time to hunt dinosaurs, only to find things have changed when they get back because someone stepped on a butterfly.
Xofer