Here's the main menu, as it appears on the 1999 DVD release.
Special features are accessed from the Spook Central menu.
The Scene Cemetary contains several deleted scenes.
The Special Effects menu provides access to a documentary, before and after comparison and concept drawings.
The before and after menu lets you compare the rough cut with the final cut with the Angle button.
The Storyboards menu lets you compare storyboards with the final cut in a split-screen view.
Above is an example from the Gozer storyboard.