You’ve got a curious subject here.
Ernest movies were a mainstay when I was a kid. Of all of them, “Ernest Goes to Jail” still holds up. Ha! It has a 5.4/10 from IMDB, a 13% on Rotten Tomatoes and a 4.5/5 from Amazon! Hum, maybe that’s the influence of nostalgia regarding the buyers on Amazon.
If one is willing to accept it for what it is, it’s still pretty good.