Four days before filming, Corey Haim broke his leg and Dinger's character had to be rewritten to include the injury. While his actual cast was removed during filming, he had to wear a fake one for the remainder of the production. In the movie Dinger says that his mother hit him with her car. In real life, Haim broke his leg while trying to teach his mom how to ride a motorbike. She couldn't use the brakes well yet, and ran into the side of a building, breaking her nose and Corey's leg.
On the wall of Bobby's room a poster for the movie "The Lost Boys (1987)" can be seen. Corey Feldman and Corey Haim both starred in "The Lost Boys".
During a dream meeting between Bobby and Coleman, Bobby gives Coleman instructions to view Bobby's home movies to learn how to act like a more believable Bobby. When the film cuts to Coleman selecting a VHS tape of one of Bobby's birthdays, the audience can see a videotape on the shelf with Tora! Tora! Tora! (1970) marked on the label. Jason Robards, playing Coleman, also played General Walter C. Short in the 1970 WWII film.
Jennifer Connelly and Ione Skye were considered for the role of Lainie Diamond. Connelly was star Corey Feldman's top choice for the role but her salary demands were too high.
This film re-teams frequent co-stars Corey Feldman and Corey Haim though originally only Feldman was cast in the film. When Lala Sloatman was cast as Shelley, she agreed to be in the film on the condition that her then-boyfriend Haim was also cast.