When Alex sits down to watch the news, the various items around the TV, magazines on the table, the cushions, cups, items on the couch etc. differ in position during the scene.
Jennifer Beals never actually danced in the movie. The dancing was actually done by three different people. Marine Jahan a professional dancer did most of the dancing. The dives through the air were performed by Sharon Shapiro who was a UCLA and National Gymnastics champion. The breakdancing parts, such as the floor spin, at the audition were performed by Richard Colon known as Crazy Legs who was the leader of world renowned breakdancing troupe The Rock Steady Crew.