Conversation so far:
How did they make the film look like newsreels of the 1920s?
Allen and cinematographer Gordon Willis used a variety of techniques, including locating some of the antique film cameras and lenses used during the eras.
Did they actually use any old footage?
even going so far as to simulate damage, such as crinkles and scratches, on the negatives to make the finished product look more like vintage footage.

Question: Who appears in the old footage?
Self-contained rewrite: Who appears in the old footage Zelig, Production uses in the film?