Continuity mistake: After Casey has turned down Harvard and is skating on the pond, she falls many times. When she falls for the fourth and final time, her hat falls off. In an overhead shot, the camera even shows it laying on the ground above her head. When she gets back up upon seeing Teddy with the zamboni, her hat has disappeared. (01:12:05)
Continuity mistake: When Casey is skating on the pond after she leaves Harvard, she falls multiple times. The second time she falls, she lifts her right leg causing her foot to come into frame. On her feet you can clearly see that she's wearing black and green snow boots, even though seconds before that she was wearing white figure skates.
Continuity mistake: In the last dancing scene, we see Casey put down one of her arms after starting to dance to the rhythm. Then we look down from above, but her hand is up again.
Continuity mistake: In the scene where Gen picks up her cheese from Casey, Gen picks up her cheese and dumps it on the counter. In the next scene, the cheese has moved and is behind a jar.
Continuity mistake: When Casey falls over while skating on her pond after rejecting Harvard, she falls a final time. We see that her hat is tangled below her hair, but when the camera suddenly pans out, her hat is far away form her head in a much to neat position. (01:12:05)