When Billie sings "I Didn't Mean to Turn You On" on stage for the first time, the microphone cord wrapped around her hand and arm, and her hands on the microphone pole change position in every shot.
When Billie kisses the music sheet, she is wearing pink lipstick, but the lip print is red.
When Billie, Roxie and Louise dance under the silver glitter, Roxie has two pieces of glitter stuck under her neck, which both fall off. In the next shot one piece is back.
When Mariah is on the "not a date" with Dice, the amount of wine in the glasses changes in every shot.
When Dice talks to Billie about his future as her producer, a drink is in his hand. He takes a sip, and lays it down in a position on his chest where any liquid in the cup would have spilled out. Then he keeps drinking, as if there still was liquid in the cup.
Dice mentions to Billie that one of his favorites is Quincy Jones, citing his Grammys and Oscars. This scene takes place in 1983. To that point, Jones had been nominated for seven Academy Awards, but had never won one. And the only award from the Academy that he has ever won to this day was the Jean Hersholt Humanitarian Award which he received in 1994.
Max Beesley's natural British accent occasionally slips out in the film.
In 1983, Dice is seen featured on the cover of "Spin" magazine, but that publication didn't release its first issue until 1985.
As opposed to the movie being set in the early eighties, shots of New York show modern cars and people walking on the street with modern mobile phones.
One of the last films to show the Twin Towers of the original World Trade Center, they're visible four times throughout the film. Three of those appearances also show the adjacent forty-story WTC Building 7, which was not constructed until 1987, though the film takes place in 1983.
In 1983, Billie wears a Vitalicio Seguros cap - fifteen years before the cycling group came into existence.
In 1983, Billie covers the Cherrelle/Robert Palmer hit "I Didn't Mean To Turn You On," which was released in 1984.
The film is set in New York City, but obvious Toronto landmarks (most noticeably the CN Tower and the Sky Dome) are visible in the background of several shots.
When Billie and Dice are in the limo, Dice mimics what Rafael said to Billie at the party. Dice was off in the crowd then, not with them.
A young Roxanne has an American accent when she's first introduced in the orphanage. In present day however, she has a thick Latin accent. Where did it come from? She was raised by Caucasian parents who adopted her.