When Reese drives Amy to the library, she mentions the story of a serial killer killing 8 students (in reference to the first movie). Not only was the body count listed incorrectly, in that film, only 6 students were actually murdered. Michelle, Damon, Tosh, Parker, Sasha, and an extra in the radio station. The other 4 deaths were Principal Wexler, the Dean, the Janitor, and supposedly Brenda who we find out at the end actually survived. 9 total deaths.
When Amy is chased down to the lake outside the college, a crew member is clearly visible (wearing a puffy blue vest and jeans) trying to step behind the boat dock shed as the killer walks onto the dock.
After Lisa wakes up in the bathtub to see her kidney removed, she hastily calls the police on her phone who promptly hang up after she tells them that she woke up in a tub of ice with her kidney gone. In real life, 911 operators are supposed to take all emergency calls very seriously no matter what so even if her emergency is reminiscent of an Urban Legend, they would never hang up on her.
Once again, it's unknown how Brenda could have survived her fall into the river in the last film, somehow transfer to another school, and register as a nurse in this film and yet never be detected or recognized by anyone.