The AVGN Movie was years in the making, and you can buy it now for $25 on Amazon (which nets you the movie with a 5.1 surround sound mix and tons of extras). You'll see behind the scenes stuff with some blue and green screen videos, as well as outtakes, adlibs, a deleted scene, alternate and extended scenes, auditions, effects breakdowns, and cast and crew interviews. There's a mini-documentary about the costumes, and a feature on the music as well as a piece with the developer of E.T. There's even a Nostalgia Critic review of the movie included as well as prior online videos from conventions and QNA's and commentary tracks. Everything combines to form about 14 hours of extras for a 16 hour total runtime.

https://www.anrdoezrs.net/links/3607085/type/dlg/sid/UUhgUeUpU48413/https://www.youtube.com/watch?v=mppSKzJkwZw