Previously unknown deleted scenes
We all know that usually much more material is shot for a movie than ends up on screen - scenes get cut for time, or because they contain material not important for the movie's main plot and they somehow mess with the general flow...
Here's a few examples
The space toilet first seen in Star Trek V actually was first shown in this scene from the beginning of Star Trek III:
This is a picture from a deleted scene from Alien: After waking up the crew of the Nostromo was supposed to get rid of their full diapers:
And this picture shows the (removed) scene in which John Hurt's character originally found out that he was pregnant with an alien creature:
And a scene from Harry Potter that actually addresses the tensions and longings that a young boy in his puberty feels - which the studio simply found too "risky":
