Jeff Dunham, who plays Lewis the Ventriloquist and his "wife" Debbie, is a popular comedian known for his ventriloquism. Debbie, renamed Diane, went on to appear as part of his act in Dunham's Identity Crisis Tour in 2010.
The movie uses two The Beatles elements. One is the song "Fool on the Hill", used in the opening and closing song number. The other is a lyric "I'm a dreamer, but I'm not the only one" from John Lennon's song "Imagine".
Ron Livingston, who is perhaps most widely known as the anti-corporate slacker, Peter Gibbons, from the film Office Space (1999), plays the antithesis of his most famous role in this film. He plays the office 'yes man' that is desperate to climb the corporate ladder.
When Tim is speaking about his 'bomb lamps', he says of Meuller, "he loves lamps". Steve Carell and Paul Rudd both starred in Anchorman, with Steve Carell's character (Brick Tamland) famously saying "I love lamp".
At around 1 hour 2 minutes, Tim tells the Swiss couple the reason Julie couldn't be there was because she broke her 'Distal Phalange'. In 'Friends' where Paul Rudd plays 'Mike', his wife, Pheobe's popular word was 'Phalange' which she used on multiple occasions.
Larry Wilmore (Williams) and Steve Carell (Barry) have starred together before in the sitcom 'The Office' where Carell was a main cast, while Wilmore appeared as a guest for 2 episodes('Diversity Day' and 'Gay Witch Hunt')