In the film, Gerard Butler's character appears as a guest on The Late Late Show with Craig Ferguson (2005). Butler and Craig Ferguson are good friends in real life, and the former has been a guest on the real show several times.
Gerard Butler, in an effort to thoroughly understand the "man's man" in American society, went behind the scenes of Adam Carolla's namesake podcast to observe him.
The film was shipped to theaters under the code name "Helpful Advice."
Kevin Connolly's character Jim is supposed to be 5 feet and 8 and a half inches. In real life, Connelly is actually 5 feet 5 inches tall.
Gerard Butler and Craig Ferguson both starred in How To Train Your Dragon together.