The other reason for the tattoo/logo thing is clearances. You have to have permission to use any logo or trademark that might show up in the video, and it's a lot easier to just eliminate this stuff up front than to deal with it later. If you'd see the amount of crap we just recently went though to shoot a scene in a movie where there are books/DVDs/video games in the shot, you'd be amazed.
People picked for these shoots, have fun! I really want to get down there this year and ride this coaster.
dt