Travis's 1974 Chevrolet Caprice convertible turns into a 1971 Chevrolet Impala convertible after it crashes off the bridge.
The bus carrying the kids seems to be traveling south because they pass through Pennsylvania on the way to Washington D.C., but on arrival, the overhead shot shows the bus coming north on Arlington Memorial Bridge near the Lincoln Monument. The re-route doesn't seem likely considering the rigid itinerary Principal Moss is keeping.
When Red picks up the kids at the school he has an all silver bracelet on his left wrist and a silver/leather bracelet on his right. When they get to the gas station they have changed wrists.
The credits thank New Line Cinema for using footage from "Jason Goes To Hell: The Final Nightmare" when the movie is really called "Jason Goes To Hell: The Final Friday".
Shortly after leaving the school on the bus, Dags and Virus are seen talking about Lisa. As they talk, you can see a building with a Canadian flag flying as the bus goes by.
Principal Moss punishes the primary characters for throwing a party in his house without his knowledge by giving them detention on a Saturday. But Principal Moss must be much nicer than he lets on; realistically, they would be arrested and charged with breaking-and-entering, destruction of private property (Miosky eating his goldfish), vandalism, and so on.