When Marrisa drops by and stays for dinner there is a scene/shot where Kirsten is standing beside her away from the dining table.
Next shot is Kirsten standing at the dinning table.
Then the final shot is Kirsten besides Marissa again.
After Julie and Luke have sex Julie says that Luke is only 18. In reality he should be about 16 because all the kids are supposed to be the same age, in the 10th grade.
Ryan says that Teresa is in town working and she's taking a semester off from school. This might be correct if she were in college but she is supposed to be in high school.
Kirsten tells Theresa that the key to preparing dinner is to take everything out of the Styrofoam containers. None of the containers seen are Styrofoam however, they are all plastic.