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.
When Mila Kunis changes in the back seat of a taxi, the filmmakers felt the driver didn't sound like an authentic New York 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.
Ashton Kutcher who is in the movie No Strings Attached (2011) has a baby with and married Mila Kunis who stars in this movie. They attempted to originally have a 'no strings attached' relationship but eventually fell in love. Both movies have a very similar theme.
When the character played by Mila Kunis is talking with her mom in a park, as soon as she talks about her prince charming not showing off in a carriage, a white carriage pulled by horses can be seen on the background.
The scene that Mila Kunis and Justin Timberlake's characters decide to break it off was originally scripted as them being naked whilst deciding to break up. The idea was then scrapped because the director, 'Will Gluck' said "It was just wrong."
The song that Dylan makes fun of and refers to as an "amiguously upbeat pop song that has nothing to do with the plot" at the end of the movie that him and Jamie watch together is called "Hey Soul Sister". They play the same song at the end of the film.
In the scene were Mila Kunis' character, Jamie, is speaking to Patricia Clarkson's character, Lorna (Jamie's mother), about the benefits of free love and how people behaved in the 1970s, you can clearly see the movie Bob & Carol & Ted & Alice (1969) playing in the background. This is Paul Mazursky's cinematic homage to free love and ties in nicely to Lorna's character "free love" spirit.
In the scene where Jamie is picking up Dylan from the airport, she takes a man's sign that says O. Penderghast on it. Emma Stone who plays a small role in this film plays a character called Olive Penderghast in the film Easy A (2009), and this is most likely a reference to it.
When Dylan is having an awkward date with the crazy girl who keeps sniffing his armpits, the song playing in the background is "Pumped-Up Kicks" by Foster The People, whose lyrics are : "You'd better run, better run..." This is a hint at the woman's craziness.
This movie stars Mila Kunis, who in real life was married to Ashton Kutcher. Ashton Kutcher starred in No Strings Attached (2011) which people say is exactly the same as this movie, in which Mila Kunis stars in. Natalie Portman, who also stars in No Strings Attached (2011), is also in the movie Black Swan (2010) with Mila Kunis.
In one scene, Dylan and Jamie are discussing about a girl they see in the park carrying a book and they think she's reading Nicholas Sparks. Richard Jenkins, who plays Dylan's father, appeared in Dear John (2010), which was based on Sparks novel and in both films Jenkins plays the disabled father of the leading man.