James Franco as Tommy Wiseau
Fun fact: Wiseau, who is incredibly private, was initially skeptical about The Disaster Artist, but has since said he "99.9%" approves of the movie. He even has a cameo in it.
Dave Franco as Greg Sestero
Fun fact: The Disaster Artist is based on Sestero's memoir of the same name.
Seth Rogen as Sandy Schklair
Schklair's work as script supervisor on The Room was uncredited, although he played a large part in the creation of the movie according to The Disaster Artist and Schklair himself.
Ari Graynor as Juliette Danielle
Fun fact: Danielle was shocked at how long the sex scenes between her character Lisa and Wiseau's character Johnny were in the final cut of the film.
Zac Efron as Dan Janjigian
Fun fact: The Room is Janjigian's first and most notable acting credit.
Josh Hutcherson as Philip Haldiman
Fun fact: Although Haldiman's character, Denny, was supposed to be the youngest character in The Room, he was one of the oldest members of the cast in real life.
Jacki Weaver as Carolyn Minnott
Fun Fact: The Room was Minnott's first and only movie role.
June Diane Raphael as Robyn Paris
Fun fact: Paris's character, Michelle, was originally meant to be played by Juliette Danielle, who was later cast as lead character Lisa instead after the original actor for that part was fired.
Nathan Fielder as Kyle Vogt
Fun fact: Vogt's character, Peter, disappears without explanation towards the end of The Room because Vogt had another acting commitment and had been assured by Wiseau that filming would be complete before he had to move on (it wasn't).
