Trivia: Christa B. Allen, who plays the teenaged Jenny, had previously portrayed another younger version of a Jennifer Garner character in 13 Going On 30.
Trivia: Five different actors from the U.S. and U.K. versions of The Office appear in the film: Amy Adams, Ed Helms, Mindy Kaling, Craig Robinson, and Ricky Gervais.
Trivia: Whilst shooting a scene where Liv and Emma slap each other, Kate Hudson accidentally hit Anne Hathaway in the face with her diamond ring. Hathaway managed to finish the scene despite being in pain and was later found sitting in a chair with an ice-pack on her face.
Trivia: At the end of the film, Michael Lang mentions he's going to California to put on another free concert with the Rolling Stones. He's referring to the infamous "Altamont concert" where the Hells Angels motorcycle gang provided security, which resulted in a number of people being beaten up, two people dying in a hit-and-run accident, one accidentally drowning, and another being stabbed to death.
Trivia: The Merc sign in this movie can be seen in High School Musical 3, during the 'Boys Are Back' scene. It's missing the letter 'M', but it's the same sign.
Trivia: Kim Zolciak can be seen in the first house party the Joneses throw in the movie. Real quick cameo of her and with her awful wigs from back in the day.