They cut the DVD!
I used to have this on VHS, but sadly it died. When I bought the DVD I was horrified to find they'd cut two scenes. The first scene I didn't mind so much, it was when Nash's girl friend came and visited Ernest in Jail, but then they cut the very final scene of the movie.
(spoiler)
The DVD ends when Ernest falls out of the sky burnt to a crisp and says the famous lines, "I came, I saw, I got blowed up." The REAL ending was after that, when we see that Ernest finally got that clerk's job he wanted. While sitting at his new desk he's shocked by the computer and becomes magnetized again and the filing cabinets start chasing him. It was a much better ending.