Several scenes in "Friday the 13th" involving graphic violence and nudity were trimmed or removed entirely by various movie censors to obtain an "R" rating instead of an "X" rating, considered more restrictive at the time.
- Brenda's Murder : the initial release omitted several shots emphasizing the impact of Jason's machete slashing her face
-Annie's Murder: The uncut version includes clearer shot of her impalement on a spear trap as she falls through and onto it with more explicit bloody effects.
- Ned's Murder in Shower Scene: The uncut version reveals more of his severed, partially decapitated head after being hit with an axe through a wooden shower door.
There also exists an "Alternate Ending " with some additional, but brief shots not seen in either the theatrical cut or subsequent official home video releases of the film. These shots includes longer glimpses of a character, Pamela Voorhees(Jason's mother) face after being killed .
Finding copies of "Friday the 13th" marked as ''uncut or featuring the "unrated version'' of the films may result in slightly differing edits of scenes due to various countries having various levels of film censorship during it theatrical releases. While many uncut versions seek to restore as much omitted content as possible some international cuts might exclude specific shots due to regional censorship regulations.
Nevertheless, these unrated cuts provides a more graphic and unmediated depiction of events during fateful encounter of Camp Crystal Lake and the infamous serial killer, Jason Voorhees, during that fateful day