Visible crew/equipment: In the very beginning of the movie, Ben is seen riding his bike over the bridge in an aerial shot. Near the top of the screen, if you look carefully at the end of the bridge you can see a police barricade at the end of the bridge. It is there because the bridge is closed for filming.
Visible crew/equipment: At the bar where the 21st birthday is being celebrated, you will see the microphone/boom come into the shot from the top of the screen. This happens while the "mom" is passing out the cut pieces of cake. It has a bright colored wind screen on it.
Answer: Gambling winnings are taxable, but using fake IDs was one way of getting around the IRS. It was also mentioned in the book that the team would keep chips until their next Vegas trip to avoid cashing out. They would also exchange money with each other so everyone would come under the $10K limit before the casino had to file a Currency Transaction Report. Also, there is no reason not to assume they would place some of their winnings as "credit" for their next visit.