Conversation so far:
What kind of hobbies does Steven Spielberg have?
A collector of film memorabilia, Spielberg purchased a balsa Rosebud sled from Citizen Kane (1941) in 1982.
Did he purchase any other film relics?
He bought Orson Welles's own directorial copy of the script for the radio broadcast The War of the Worlds (1938) in 1994.

Question: What other film memorabilia does he own?
Self-contained rewrite: In addition to balsa Rosebud what other film memorabilia does Steven Spielberg own?