James Franco claimed that Alien is based on underground rap artist Dangeruss. There was much speculation that his character was based around another rap artist by the name of Riff Raff. Franco dismissed those claims when speaking to GQ in 2012, yet he posted a picture of himself online with pictures of Riff Raff on his wall and referring to himself as "film game riffraff". Also, Riff Raff released e-mails between himself and Harmony Korine in which Korine offered Riff Raff the part of Alien. Riff Raff is filing a $10 million lawsuit against Korine and spoofed Franco in an episode of One Life to Live (2013).
The gun barrel blow job scene arose form improvisation on set. Harmony Korine suggested the girls emasculate Alien by sticking the gun barrels in his mouth. It was then James Franco's idea that Alien would get turned on, leading him to perform oral sex on the guns.
Emma Roberts was originally cast but the film required her character to indulge in a three-way sex scene, causing her to drop out of the film due to unspecified "creative differences." She was replaced by Ashley Benson.