Question: Are John R. DeMarco, Don Juan, and Dr. Jack (John) Mickler possibly all one individual contemplating romance at an older age? They can be considered the Id, Ego, and Superego of one person, for they all have the same first name. Jack, John, and Juan are all derivatives of John.
Question: I'm unclear about the ending in this film. Was he really Don Juan and the stories he told about his sexual antics are true after all? And was he lying when he said that he really grew up in Queens, etc., just to get out of the hospital?
Chosen answer: I think the point is that it doesn't matter. He can be Don Juan if he likes - so can anybody - and who is to tell who someone else really is?