Principal photography occurred in the Ottawa Valley (Ontario & Quebec, Canada) and in the Towns of Carleton Place and Mississippi Mills in February 2020.
Mel Gibson is the eighth Academy Award winner to play Santa Claus, after:
- Edmund Gwenn - Miracle on 34th Street (1947)
- Thomas Mitchell - The Miracle on 34th Street (1955)
- Art Carney - The Night of the Meek (1960), The Great Santa Claus Switch (1970), and The Night They Saved Christmas (1984)
- Sir Richard Attenborough - Miracle on 34th Street (1994)
- Billy Bob Thornton - Bad Santa (2003) and Bad Santa 2 (2016)
- Tom Hanks - The Polar Express (2004)
- Jim Broadbent - Arthur Christmas (2011) and Get Santa (2014)
The black vehicle driven by Skinny Man is a 1978 Plymouth Fury 4-door sedan.
The check from the U.S. Treasury that Chris opens at the bar is for the amount of BLP 675.98. BLP stands for Business Lending Partners.
Ian and Eshom Nelms originally wrote the screenplay for Fatman in 2006, and had been shopping it around ever since then.