In the beginning, and once later on, Jo describes Hope as a "hypochondriac". The way she describes it, Hope would be more accurately described as a "germaphobe", since hypochondriasis is a disorder in which one fears they actually have a certain disease or illness, it is not a fear of or aversion to germs.
When Jo receives the letter from Carnegie Mellon University the first sentence of the letter reads as follows:
Dear Ms. Mitchell
On behalf of the Office of Admissions at Carnegie Mellon University , I would like to congratulate you on your You are now challenged with making the very important decision of selecting which college or university you are going to attend.
When the principal is doing his dance whilst filming himself, the image is being played out to the entire school. However the image the students see is the image from the directors camera rather then the small mini cam the principal is using to film himself. As such the image the students are watching should be from the mini cams perspective, not from our perspective.
In the beginning of the film, when the man with the iced coffee drinks slips, the cups fly off and some of the iced coffee gets all over Abby. In the 2nd, the amount of iced coffee that got on Abby changes. And after Jo tells Abby that she looks great, there's way less coffee on Abby than there was in the last two shots of her.
It is mentioned that this movie takes place in Ohio and it is mentioned in the first movie that the story takes place in Illinois. However, the name of the school is the same in both movies. Since Ron Duvall is the school principal in both movies, it is very unlikely that Mr. Duvall moved to Ohio and is now principal to a school that happens to have the same name as his previous school.