As is with all other Christopher Guest films, very little of the movie has a detailed script. Guest generally writes an outline so that the actors know what needs to happen in the scene, does a maximum of two or three takes, and has no rehearsals prior to filming.
The movie Catherine O'Hara is watching on television in the beginning of this film is Jezebel (1938) starring Bette Davis. She follows along with the dialogue suggesting she is very familiar with the movie. The dialogue is also repeated at the end of the film when O'Hara is teaching the acting students.
'For Your Consideration' features a cameo by John Krasinski, known as Jim Halpert on the NBC sitcom The Office (2005). British comedian Ricky Gervais, also known as David Brent on the BBC version of The Office (2001), appears in the film as Martin Gibb.
The movie within the movie "Home For Purim" - which ultimately is re-titled "Home For Thanksgiving" - may be a reference to a real TV movie, NBC 1966 30 minute "Eternal Light" production of "Home For Passover." It starred the late Gene Wilder.
The trivia item below may give away important plot points.
In a bit of life imitating art, Catherine O'Hara received a large amount of Oscar buzz for her performance in this movie. She was nominated for and won several precursor awards, and many awards experts predicted she would receive an Oscar nomination for Best Supporting Actress. Like her character in the movie, O'Hara failed to be nominated.