After director Rob Reiner screened the movie for Stephen King, he noticed that King was visibly shaking and wasn't speaking. He left the room and upon his return, told Reiner that the movie was the best adaptation of his work he had ever seen.
Kiefer Sutherland claimed in an interview that, in one of the locations of the film, a Renaissance Fair was being held and the cast and crew attended and bought some cookies. Unfortunately, the cookies turned out to be laced with pot and, two hours later, the crew found Jerry O'Connell high and crying somewhere in the park.
River Phoenix, Corey Feldman, Wil Wheaton and Jerry O'Connell got into a lot of mischief in the hotel they were staying in during filming. This included throwing all the poolside furniture into the pool, Wheaton fixing video games in the lobby so they could play them for free and Phoenix (spurred on by the other boys) unknowingly covering Kiefer Sutherland's car in mud, only discovering whose car it was when Sutherland confronted a scared and nervous Phoenix about it later.
Rob Reiner considers this the best film he has ever made.
Corey Feldman has stated in several interviews that of all the characters he's played, Teddy was actually the closest to his personality and personal life at the time.