Corrected entry: At the end of the movie, the boys wonder if Chris will acknowledge them in High School since she is a Senior(4th yr) and they are Freshman(1st yr). Earlier in the movie, the kids ages were established as 15 for the boys and 17 for Chris. So they should be 2yrs apart in school, not 3yrs.
Corrected entry: When the babysitter gets a flat tire you see her steering the car to the right side of the road to pull over. Yet, when they show the car being pulled over it's on the left side of the road. (00:19:10)
Corrected entry: In the part of the movie when the "babysitter" is in the passenger seat of the vehicle, her seat belt is on. When they flash away and then back to her the seat belt is off. They cut away and come back for a third time, she then has the seat belt on again.