https://youtu.be/OzyA2wjfX_E

Here's a video of the setup. Other videos said that they used people instead of rolling them out like the building facade because this field uses natural grass so they have to limit the number and weight of the carts. One guy said he applied for the job and was chosen with about 500 others. They had to be able to tolerate a 50 pound costume for 5 hours, practiced for two weeks, and did not get to watch any of the game.