Along with the television version, many international theatrical and video versions cut out Elvira's "trick" during the Las Vegas musical number.
The widescreen version is actually the regular full screen version but with the top and bottom blacked out. This is proven in the scene were the kids are watching Attack of the Killer Tomatoes. For the scene were a woman with a shopping cart is running from an over-sized tomato, the board with rollers the tomato is sitting on is cut off. As is the shot of Elvira's Elvis t-shirt when she suddenly sits-up from her nightmare. This is because the movie was shot in fullscreen, and matted for theaters. The extra space in the fullscreen version is dead space that was never meant to be seen.