slightly off topic but still on the same subject matter
I remember the VHS version of Nightmare on Elm Street 2 being a lot darker than the DVD and BD versions to the point where you could never really see Freddy's face properly. certainly gave it a more sinister atmosphere
also the music during the credits were different. I don't think the song that was used the DVD/BD version was originally licensed for the first home video versions so it was replaced with a suite from Christopher Young's score