Trivia

Bill often had panic attacks before the live performance of a Saturday Night Live (1975) episode. To help him relax, his then-wife came to the SNL studio to do Lamaze breathing exercises with him.

He originally moved to Los Angeles, California with plans of becoming a director. At that time, before he became a regular cast member of Saturday Night Live (1975), being a comedian or actor was never something he thought of doing.

In an interview with Conan O'Brien, La guerra de las galaxias (1977)-fan Bill stated that he knew the first time he saw his then-girlfriend's apartment, she would be his wife: she had "Star Wars" curtains in her living room.

His Saturday Night Live (1975) audition was him performing impressions of Al Pacino, James Mason, Tony Blair, and Peter Falk as Vinnie Vedecci, his Italian talk-show host character.

Even though he is severely allergic to peanuts, he was chosen to replace Robert Downey Jr. as the commercial voice of Planter's Nuts commercial mascot "Mr. Peanut". (2013)

In the feature film, Hot Rod (2007), Bill portrays a character named Dave, who tells a story about tripping on acid (also known as LSD). In the acid trip story, Dave gets a piece of metal stuck in his eye. This acid trip and eye injury story actually happened to one of Bill's friends, who Bill subsequently took to watch the film.

Confessed to Ellen DeGeneres that one of his guilty pleasure TV shows is Snapped: Killer Couples (2013). He's also a huge fan of the true crime series Forensic Files (1996).

Part of Judd Apatow's stock company of actors. He has appeared in five of his films.

Met his now-ex-wife Maggie Carey, while performing as a member of a comedy troupe in a backyard in Van Nuys, California (a suburb of Los Angeles, California). She was sitting in the front row, and afterward, they were introduced by a mutual friend.

Is a producer on the 13th season of South Park (1997).

Monty Python, This Is Spinal Tap (1984), and early Woody Allen and Mel Brooks movies are his biggest comedic influences [Empire Online April 2008].

Has been in six films that have grossed over $100 million (Ligeramente embarazada (2007), Súper cool (2007), Una guerra de película (2008), Una noche en el museo 2 (2009), La era de hielo 3 (2009), and Lluvia de Hamburguesas (2009).

While a guest on the PBS genealogy show Finding Your Roots with Henry Louis Gates, Jr. (2012), Hader discovered that he is directly descended from both King Edward I of England and Charlemagne, King of the Franks and first Holy Roman Emperor, who united most of Western Europe during the early Middle Ages.

Hader and his then-wife (Maggie Carey) welcomed their first child, daughter Hannah Kathryn, on 6 October 2009. Their second daughter, Harper, was born on 28 July 2012, and their third daughter, Hayley Clementine, on 15 November 2014.

Announced he would leave Saturday Night Live (1975) on 18 May 2013, at the end of the 2013 season. He further announced his plans to move to Los Angeles, so both he and his filmmaker then-wife (Maggie Carey could pursue more opportunities there. (mayo de 2013)

Father manages an air freight company. Mother is a dance teacher.

His ex-wife, Maggie Carey, is a filmmaker who has won awards for both documentaries and narrative films.

Member of the sketch comedy group Animals from the Future.

Dropped out of Scottsdale Community College.

Attended Cascia Hall Prep School in Tulsa, Oklahoma.

He has German, Danish, Irish, and English ancestry.

Has two younger siblings.

Was invited to join the actor's branch of the Academy of Motion Picture Arts & Sciences. (2023)

He has a severe peanut allergy.

Studied at the New York Film Academy College of Film, Media and Performing Arts (NYFA).

When he was 20 years old he was the driver of actor Martin Kove who is most known for his role in the Karate Kid.

He was interviewed by Tracy Smith on/for the 31 March 2019 broadcast of CBS News Sunday Morning (1979). The interview was filmed primarily on the Sony Pictures Studio lot in Culver City, California, USA, the studio and primary filming location for Hader's HBO sitcom, Barry (2018).