The tête-à-tête between Aiden and Norah re: walking her home was moot, thus inane, being that Norah DROVE to the party.
When Norah was telling Aiden what her goals were, she said she wanted to get an athletic scholarship and go to an Ivy League school. A little research would show that Ivy League schools do not give athletic scholarships.
Michelle clearly said, while on the phone with 'Josh', that her first date with him would be that coming Friday, which it indeed was when it took place. But the next morning - Saturday - she drove her daughter and Channing to school as usual and the two girls were shown with their bookbags sitting with other students on the school bleachers. School would not be in session on Saturday.
Helene assured Michelle that her ex-husband Dan was long gone and wasn't stalking her anymore - since she had lived in the same apartment that Michelle moved into, yet she would have no way of knowing that for sure, since she couldn't possibly know if he had given up stalking her and whether or not he was long gone. It's also unlikely that Helene wouldn't know that the real Josh was on vacation in Israel since he was the building contractor there and he had been on vacation for over a month when Michelle first told her about Josh being her new boyfriend and she had just met him there in the building.