If you are looking for the most complete version of the film available legally:

This special repack compiles every known deleted, extended, and alternate scene from John Landis’ 1981 horror-comedy classic. Previously available only in low-quality bootlegs or incomplete DVD extras, these moments have been newly sourced, remastered, and repackaged for the ultimate werewolf fan.

The most significant deleted scenes involve an extended sequence at the beginning of the film. In the theatrical cut, David (David Naughton) and Jack (Griffin Dunne) are kicked out of the pub The Slaughtered Lamb and wander onto the moors.

For the definitive American Werewolf in London deleted scenes repack experience, collectors often turn to specialized horror forums and archival sites where enthusiasts sync deleted audio with recovered workprint video. Final Thoughts

Director John Landis has frequently mentioned a scene where the werewolf graphically dismembers two tramps.