Project was originally titled "Fred Claus", but was changed due to a potential rights issue. It was then retitled "Joe Claus." After the rights were cleared, the title returned to "Fred Claus."
The wardrobe department consulted Levi's and had special 501's created to accommodate Vince Vaughn's sizes exactly.
Release prints were shipped to some theaters under the fake title "Brotherly Love".
Three famous brothers cameo as themselves at 'Siblings Anonymous'. The first is Frank Stallone, who speaks about Rocky (1976) and 'Rambo', two major blockbuster film series that star his brother Sylvester Stallone. The second is Roger Clinton, half-brother of the former US President Bill Clinton. The third is Stephen Baldwin, the youngest Baldwin Brother (specifically he has issues with the eldest and arguably most famous, Alec Baldwin.)