In the scene where Marty is dressed as Darth Vader in George's bedroom, you will notice the hair dryer is on his belt on his left side as he's inserting the Van Halen tape. Then, when you see him play the tape, the hair dryer is now on his right side of his belt.
I only saw this extra one time, but if you watch the deleted scenes on the first disk of the BTTF trilogy the darth vader scene was really much longer and Marty used the hair dryer...I'll have to watch it again, but in between the cuts is probably where this slip-up happened...good job.
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