I forgot about this one, and it's just a reminder anyway, but it might save you some points.
At the NATs, I saw someone remove their safety thong to hand the handle to the helper while he got the airplane. Fine, and considerate - except that he removed the thong and shifted it to his left hand *while the airplane was still rolling out*. The judges did not notice and did not DQ him, although they could have. Additionally, this airplane did not have brakes on the wheels, so the rollout was quite extended and the pilot made no effort to get it to stop, also adding 10-15 seconds to the timing, which only stops at wheel stop.
It's a little thing, but the flight continues until the airplane stops rolling, and you have to have your thong on until the flight is over. So, keep paying attention until the airplane is halted on the ground. If it's an electric, keep paying attention until the arming plug is removed (although you can remove the safety thong, you have to keep holding the handle).
Brett