They record the performances so, they re-review the top performers in each division. I know there were quite a few athletes, parents and fans last year questioning why a team didn't receive a paid bid at an event when this team had one of the highest percentage of perfection at the event but, there were 5 Halls (if I remember correctly). When you compared their video to the teams that won the paid bids you could see how it would be easy for one Hall to judge harder when it came to something like the dance, tumbling technique, etc. compared to the other Halls.
But, level 1, 2, 3, 4.2, 4 and Res 5 are in competition for the same bids with different judges. Worlds had the same judges.