It sounds like you're asking about a (or behind-the-scenes content) from the DVD/Blu-ray of Pirates of the Caribbean: At World's End (2007).
– a humorous mockumentary-style featurette showing how the crew created the multiple hallucinated Jack Sparrows (from Davy Jones's Locker). It includes interviews with Johnny Depp playing several versions of himself, plus visual effects breakdowns.
If so, one standout feature on the home release is: