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The working titles of this film were Joe Palooka in the Witness and The Witness. Blacklisted screenwriter Henry Blankfort was not credited onscreen or in reviews, but wrote the script using the pseudonym "Jan Jeffries." His credit was restored by the Writers Guild of America in 1998. For more information on the "Joe Palooka" series, consult the Series Index and see the entry for Joe Palooka, Champ in AFI Catalog of Feature Films, 1941-50.