While waiting for the bus Jay says that Krista tested the entire junior class about the infestation. Later, when Abigail is 22, he says "I'm a sophomore, and you'r a woman."
After Abby blew out candle #9, she opens the curtain. In the next shot, she opens them again.
When Abby gets her driver's license, her date of birth is listed as 07/07/95. It would not make sense for school to be in session during this time, as it would be summer break.