Austin Powers: The Spy Who Shagged Me. - Photo Shoot
During the photo shoot, if you watch carefully, you will notice that the black square/box on top of the camera disappears during one segment. You will also notice that Austin needs better deoderant because eveytime his lifts his arm, we can see a huge sweat spot.
The sweat spots are not a slip-up; Austin is just working hard. If the sweat stains appeared, disappeared, reappeared...then you could call it a slip-up.