After hearing that Brett signed a deal with a record company without Miles, Nora runs up the stairs upset to find Brett. Before she runs up the stairs her hair is curly and when she finds Brett and starts getting angry with him her hair is straight.
When they are standing looking over the bay, we can see the port on the other side. There is a large ship which is being loaded. After there is a close up of the two talking and they are about to begin dancing we see the cranes are up and the ship has vanished.
When Nora is talking to Director Gordon about Tyler being her new dance partner, there are a few papers lying around on her desk. In the next shot, the paper is tidy. But after Tyler repeats himself as "adequate", her desk is back to messy again.
When Nora is first talking to Tyler about him being her partner, her necklace switches from side to side.
When Tyler is dancing at the club/party, he pops his collar. They go to a close up, and his collar is down, but when they pull back out, his collar is popped again.
The final dance is far too sexy for a high school production.
Tyler is eating with his foster family the day he is approved to rehearse with Nora. The logo on the cups and bags on the dinner table is for a fast food chain in the Western US. There are none in Baltimore, MD, where the movie is set. The nearest (according to the company's website) is in Oklahoma, more than 1,500 miles away.
The main characters look too old to be in high school.