In the Minecraft Movie event on Bedrock edition, you can get out from the Outer Walls's, using a bug.

So, I saw, that one of the player is outside of the map, and jumping around in the Nether area.

You can go out using only a Lava Chicken, and pressing Shift multiple times in the lower balcony.

You can get inside one of the Nether portals, and go to the nether, the whole lobby is bugged, and mobs can’t even spawn.

I tried it so i can tell you more information about the bug, but this bug is breaking the minigame. And even, some of the mobs can get inside the Nether portal too.