i am jack's unreliable narrator

Comparing Humphrey Bogart's cool, predatory interpretation of Philip Marlowe in Howard Hawks' The Big Sleep to Elliott Gould's lonely, mumbling, dislocated version of the same character in Robert Altman's The Long Goodbye, my thought is that the earlier movie takes Marlowe's first-person narration in the novels at face value and presents the character as he sees himself, while the later film treats Marlowe as an unreliable narrator and provides a better idea of how he might seem to others.

(Then again, maybe it's just that Chandler's hero just seems preposterously anachronistic re-situated in 1973 ...)