- He is the son of Edith Alexandra (Palk) and Emerson James Arnett, who was president and CEO of Molson Breweries, from 1997 to 2000. His family is from Manitoba.
- Speaks fluent French.
- Loves to play his Xbox. His gamertag is Roncore.
- His then wife, Amy Poehler, also played his wife in several episodes of Arrested development - Les nouveaux pauvres (2003).
- Played brother to his then wife Amy Poehler in Les rois du patin (2007).
- Does voice-over work for GMC trucks and Lamasil tablets.
- Attended French-speaking schools in Toronto.
- Will and Amy Poehler became the parents of their second child, a son named Abel James Arnett, on August 6, 2010. Abel weighed in at 7 lb, 13 oz.
- On October 25, 2008, Will and his then wife, Amy Poehler, became parents to a son, named Archibald William Emerson "Archie" Arnett, 8 lb, 1 oz, in New York City at 6 p.m.
- Good pal of screenwriter/playwright Dave McLaughlin. One of Will's first screen roles was in McLaughlin's Southie (1998).
- Friend of Jerry O'Connell.
- His ancestry includes English, some Scottish, and smaller amounts of Irish, Dutch, and French.
- Ex-brother-in-law of Marisa Miller and Savannah Miller.
- Ex-son-in-law of Mark Miller and Beatrice Miller.
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