When entering sectionals, Casey is not allowed to enter due to the fact she is in 5th place, since 4 are only allowed to take part. Five people are mentioned to be taking part in sectionals at the near end of the film.
While Casey is skating on the pond, right before Teddy arrives, she falls down on the ice. In one of the shots, as her leg flies up, she isn't wearing skates, but rubber boots.
In the opening scene Casey is skating on an outdoor pond (later revealed to be in Connecticut) wearing warm clothing and even a hat. A pond in the Northeast might be frozen between November-March. In the next scene, her teacher is suggesting she work on a physics project over the summer meaning it is around May or June.
At the end, when Casey is skating on the ice lake and Teddy appears on the Zamboni, she drops her hat. In the overhead shots, the hat disappears.
When Casey talks the girl from Harvard, the girl's hair starts out on her shoulder, then changes in every scene.
Velocity times momentum does not equal acceleration.
Teddy's Zamboni is too heavy for the ice on the "pond" near Casey's house. The only reason why it works on film is that it wasn't an actual frozen pond, but a specially constructed ice rink. And something else: Teddy couldn't possibly have driven the Zamboni out into the boondocks. It would have been a logistical nightmare for him to get it over to Casey's homestead, to say the least. Not a street-legal vehicle; a flat-bed truck would have been required for transport.
Casey's explanation - when she is making her video with her friend - is incorrect. She spins faster because of conservation of angular momentum. By pulling in her arms, she decreases her radius, thus decreasing her moment of inertia. Thus, her angular velocity increases - i.e., she spins faster.
Casey is shown competing under theatrical lighting. USFSA skating competitions do not have theatrical lighting.
Casey is shown competing with music that has words in it. USFSA skating competitions do not allow music with words for programs. If words are used then the skater has points deducted.
At the party when Casey has figured out that the boy will swing through the window (and he does), as he goes through the wooden frame there is no breaking or shattering of glass as there would have been if break away glass had been used in the scene.
When Casey falls on the ice while skating on the pond, her leg goes up and she is wearing black rubber boots, not ice skates.
The "window" that a teenage boy plows into at the high school party is clearly made of plastic or a similar material, as no glass shatters upon impact.
Upon suddenly realizing that figure skating is her life's calling, Casey abruptly ends her Harvard interview, excusing herself awkwardly. The scene should never have ended this way, as it seems to contradict Casey's character of a responsible student, disappointed her mother, and needlessly wasted the Harvard man's time. Casey should have at least finished out the interview and waited for the scholarship results, which would have been a helpful indicator of whether to pursue competitive figure skating or Harvard.
Right before her final routine, Tina gives Casey earplugs to encourage her to ignore distracting responses from the audience. Casey would be used to practicing her routine without earplugs, and this could potentially throw her off.
Before Casey's first skating competition, when Tina is standing outside of the car, she's talking about the CDs she'll play on the way back. At one point, she says "your music," but her lips are saying something different.
In various shots of Casey skating, there is very noticeably a double.
There are many times during the mid-end of the movie where you can see a microphone hanging from the edge of the screen. (In those scenes, the microphone is covered by a black, furry microphone cover.) There is also one scene where the pole of the microphone is easily seen.
Casey Carlyle, who lives with her mother in Connecticut, goes to a skating competition in Pennsylvania, leaving her disapproving mother at home. Mom has a change of heart, leaves home after the competition starts, drives 200 miles and arrives in time to see her daughter skate.
In the first competition, the results list spells Zoe's hometown "Wooster." It should be spelled "Worcester."
Tina's character is presented as an accomplished, former athlete and skating coach. However, she is never shown actually skating in the movie, wears street shoes on the rink, and even asks her daughter to demonstrate skating elements to her skating class.
No explanation is given as to what happened to Casey's father, nor as to why he is not at all present in her life (even for major skating competitions).
The only way she and the other skaters are seniors at 16 is if they skipped a couple of grades.
Teddy and Gen look nothing alike, even though they are supposed to be brother and sister.