Steve Stekeley's 1948 Noir The Scar (also known as Hollow Triumph) is perhaps most notable because its leading man is Paul Henreid, who six years earlier had played the part of Victor Laszlo in Casablanca. Beyond that, The Scar is at first sight an eminently ephemeral movie, easily forgettable. But it's interesting in so far as it problematizes the very process of memory and recognition.
Henreid's character in Casablanca is a Czech resistance hero who is strangely both the center of the plot and utterly marginal. For though the film ostensibly revolves around Laszlo's efforts to flee the Nazis and seek asylum in America, what we remember is the tension and romance between Ingrid Bergman (playing Laszlo's wife) and Humphrey Bogart as Rick Blaine, the bar-owner who has the letters of transit that would make Lazslo's escape possible.
Similarly, in The Scar, Henreid again plays a character who fades from view... the difference being that in this film Henreid also plays the character who replaces him. Moreover, this is a film about the replacement itself, and the effect that it has (or, oddly enough, doesn't have) on the audience.
Read more at Projections.