Can you really get "pulled over" and ticketed while parked?

My friend(17) got “pulled over” tonight while parked in the parking lot of a closed business after hours. He pulled over to talk to his friends he saw walking, some of the kids walked over and sat in his car, to talk (just until there friend Tyler was off the phone with his dad a couple of feet outside of the car). The vehicle was in park, keys out of ignition and the cop came over and asked for license/registration etc. after a bit of dialouge and his parents coming, he was given one ticket of $156 and it was for having people under the age of 25 in his car.

In our state (Vermont)the following is the VT teen driving law :

http://www.drivinglaws.org/teen/vermontt.php

So the question is Can you really get “pulled over” and ticketed for having people in the vehicle, again, while it was in park, shut completly off, and keys out of ignition?