When Mila Kunis changes in the back seat of a taxi, the filmmakers felt the driver didn't sound like an authentic New York City taxi driver. So they used Mila's father Marko Kunis to dub his voice. Marko worked as a taxi driver when he first arrived in the United States and still has a Ukrainian accent.
Mila Kunis used a "butt double" for her character's full nude scene despite the fact that she appears semi-nude in side views in a handful of scenes. She said she had no issue being nude on set but wasn't going to actually show anything on screen.
Justin Timberlake's character has a lightning-bolt tattoo, and Mila Kunis' character wears a lightning-bolt necklace throughout the movie except in the photo-shoot scene when they are angry with each other.
"Bryce", the male lead in the fictional romantic comedy shown throughout the film is played by Jason Segel in an uncredited role. He also appeared as Mila Kunis' love interest in Forgetting Sarah Marshall (2008) and as Justin Timberlake's romantic rival in Bad Teacher (2011), both romantic comedies.
When playing basketball, Woody Harrelson is shown dunking. This is a nod to one of the subplots of White Men Can't Jump (1992).