Traumatic Haircut : All the cast were taken for short, 50s-style haircuts. According to the "Look Back" special on the DVD, Ethan Hawke found this upsetting.
True Companions: The members of the Dead Poets' Society were made to share a room before and during filming to strengthen the bond between them and make them believable friends.
What Could Have Been: An earlier draft of the script included Ginny Danbury, Chet's sister and a friend of Chris's. Along with giving Chris more screentime, Ginny also had the role of Hermia in the play and the actress who played her, Lara Flynn Boyle, still appears in those scenes even though the scenes with her as Ginny were cut. Even though those scenes weren't technically necessary for the rest of the movie, it would've been nice for Chris to have a friend outside of her love triangle with Chet and Knox.
Liam Neeson and Dustin Hoffman were considered for the role of Mr. Keating.