When the film was being planned by Paramount, executives thought that Kevin Spacey was too old to portray Bobby Darin, who died at 37, and wanted Leonardo DiCaprio instead.
Many writers have requested WGA not to associate them with credits for the screenplay. Some of them include Tom Epperson and James Toback who worked with Barry Levinson.
The Writers Guild of America, after sorting through the mess of writes, rewrites, and re-rewrites, decided that the screenplay is credited to 'Kevin Spacey (I)' and Lewis Colick who worked on it back in 1987 when Warner Bros. hired him.
The James Toback draft which followed an earlier draft by Paul Attanasio concentrated on Sandra Dee's alcoholism and childhood molestation by her stepfather. This draft was then given to Lorenzo Carcaterra. His draft, the last before Warner Bros. and Barry Levinson left the project, was 164 pages long.
During the song "Some of These Days", Kevin Spacey says "ah, do it, Sophie", as Bobby Darin did in the original recording. This is a reference to Sophie Tucker, the "Last of the Red Hot Mamas", who first recorded the song on February 24, 1911, and later re-recorded it in 1926.