When Heidi and Zoe meet in the theatre in New York after the basketball game, Heidi's scarf goes from around her neck, then not, then back, between shots.
On their first day of school, Heather says she's working out in the morning; at the dinner table that evening she says she was working out after school.
At the end of the movie they were playing against each other in the WNBA. In fact, Heidi played in the WNBA in 1997 with the LA Sparks and 1998 with the Washington Mystics, and Heather played in the WBA for the Sacramento Monarchs in 1999. They were never in the league at the same time.
One referee signals a technical foul when asked to call a time out.
The US flags in the first gym are backwards. When displayed vertically against a wall the field of stars should be on the flag's own right, the observer's left.
The PA amplifier does not have speaker wires connected to the outputs.
In the scene of the twins learning the jump shot, the young man teaching them says "That's how Magic Johnson won back-to-back MVPs." The film is set in 1985. Larry Bird had won back-to-back MVPs in 1984 and 1985 and would win again in 1986; Magic Johnson didn't win the MVP until 1987.
Almost all of the hairstyles/clothing are of the early 2000s instead of 1985.
Visible on the streets are a few cars and an SUV from the filming year, 2002;l the film is set in 1985.
The high-school gym where the majority of the scenes of this 1985-set movie were filmed displays many 1990s championship banners.
At the party there are modern compact discs by the stereo. In the 1980's, records and cassettes were played at parties.