To stay with the 'consumer economy' tone of the film, from beginning to end there are approximately 73 companies who have product placements shown; from logos to actual items ranging in entertainment, electronics, fashion, food, hygiene, and cars. No money was received from all the product placements in the film.
Due to the level of profanity and adult themes, the family friendly Archie comics which published the original Josie and the Pussycats stories, would denounce the film and discouraged people from seeing it. Strangely, many years later, the comics would not only be fine with, but also promote the television series Riverdale (2017) based on their Archie stories (and which features Josie, Melody, and Valerie as secondary characters). Which arguably had much darker adult themes in its storylines than this movie.
Rachael Leigh Cook's singing voice was dubbed by the lead singer of the band Letters to Cleo, Kay Hanley.
Rachael Leigh Cook, Rosario Dawson, and Tara Reid had to go to a "Band Camp" for two weeks to learn how to play the instruments their characters used in order look correct on screen. Tara Reid found this funny, because "this one time at band camp" was a running gag in her previous film American Pie (1999). However, they did not become proficient to the level that they could play effectively on the soundtrack. The actual music was supplied by studio musicians.
In order to preserve the wholesome image of Josie and the Pussycats, Archie Comics demand there be a scene where Josie and the Pussycats were seen brushing their teeth.