Continuity mistake: When Axl and Mike are driving to the lake and they get stuck, the area around them changes as they drive. When viewed inside the car they pass by more lawn areas, but then when they are outside the car it's a more rural area with trees and bushes that are not seen when inside the car. Also the volleyball players disappear when viewed from inside the car.
Continuity mistake: When Frankie pulls up her sleeve to let the teacher test her blood pressure, there are notes on her arm which Axl wrote. After she gives the speech about how she is not going to quit just because her teacher tells her to, she pulls up her sleeve again and the notes are gone. (00:16:40 - 00:18:05)