His father was the CEO for the Canadian beer giant Molson Inc.
Got his start doing voice-over work for GMC Trucks and Lamisil antifungal tablets.
His then-wife, Amy Poehler, played the wife of his character on Arrested Development and his sister/skating partner in the Will Ferrell comedy Blades of Glory.
Is friends with screenwriter Dave McLaughlin and starred in the scribe's Southie and On Broadway.
Reunited with Arrested Development creator Mitchell Hurwitz and costar David Cross for Running Wilde; in addition to his acting role, Arnett also helped create the series and served as a writer and executive producer.
Is a huge hockey fan and supporter of the Toronto Maple Leafs.
2004, Screen Actors Guild Awards — Outstanding Performance by an Ensemble in a Comedy Series: Nominee
2010, Emmy — Outstanding Guest Actor in a Comedy Series: Nominee