Actor Allusion: A bottle of Herbal Essences can be seen as Lucy gets out of the shower. Britney Spears endorses Herbal Essences.
Blooper: When the three girls are partying in the Louisiana Hotel Room, Lucy can be heard saying "Zoe" instead of Kit.
Celebrity Paradox: When Lucy's dad is talking to her in the hospital, a copy of USA Today with Britney Spears on the cover can be seen.
Creator In-Joke: The girls sing "Bye Bye Bye" at one point - a song by N*Sync. Britney Spears and Justin Timberlake had dated.
Creator Killer: In addition to torpedoing Britney Spears as both an actress and film producer from the get-go, the film also wrecked the career of director Tamra Davis, who hasn't directed a single theatrically-released film — aside from a few self-produced documentaries — in the years since, and has been working almost entirely in television. Averted, however, by screenwriter Shonda Rhimes, whose career wasn't harmed in the slightest by working on this film.
Old Shame: In later years, Britney Spears admitted that she didn't put enough effort into learning to act and thought that she could just show up on-set and essentially play herself, which ended up hurting the film. Again, this trope is averted by writer Shonda Rhimes; while she might not consider it a high point for her career, she's also defended this film against its detractors and said that the critics "didn't get it."
Product Placement: In addition to Herbal Essences above, Pepsi is featured prominently in the film. Britney Spears of course endorses that too.
Real-Life Relative: Jamie Lyn Spears, Britney's little sister, plays the young Lucy in the film's prologue.
Star-Derailing Role: Granted, odds are Britney Spears' acting career wouldn't have gone anywhere anyway, due to her taking time out to start a family and then her well-documented personal problems, but the dismal reception of the film and her having been involved in its production at such a high level very firmly put the skids on her attempt to break into film.