When Zenon is standing on the school pool deck putting on her goggles, her hair is in a ponytail. After Margie pushes her in, her hair is loose in the water, floating all around her head.
When Zenon's dad tells her she'll be grounded to Earth, he points outside--where the earth is moving one way and the stars are moving the other.
At the beginning, Zenon's alarm clock says it is Monday, April 18, 2049. April 18, 2049 is actually a Sunday.
In outside views of the space station, there are windows nearly all around, but on the inside there are only windows inside some rooms, not in the halls like the outside shows.
Near the beginning of the movie when Zenon is looking out her window on the space station, when the camera zooms out the station itself is leaning, but back into the space station, everything appears to be level.
Zenon messed up an assignment in chemistry and is admonished by the teacher for using Celsius instead of Fahrenheit. No chemistry class would ever use Fahrenheit; metric is used for everything in science, even in countries that still use imperial measurements.
When Zenon closes the doors on Windom and Lutz, Windom says, "Nooo!", but his mouth reads, "Ahhhh!".
When Zenon witnesses Mr. Lutz sneaking into the security computer room to plant a computer virus, why didn't Commander Edward Plank and his space station workers have security guards watching the computer mainframe restricted area which would've prevented both Zenon and Mr. Lutz from sneaking into the room and Mr. Lutz from accessing the codes and putting the entire crew of people in danger of losing oxygen or losing their power.