Also, in that same scene with Mulder and Scully investigating LaBonge, towards the end of his demonstration (11:35-11:45) you can see his left sleeve go from pulled down to up and then back down.
When Mulder and Scully investigate the young magician, Billy LaBonge, he magically shows a big coin. You see it lying on the table, next shot is from a different angle, and the coin is gone. Next shot it's there again. Magic?