If you're assigned to the yellow lane as Infernus, you'll spawn on the floor and have to jump on the zipline manually. I've had this happen multiple times in the past few weeks. It took me a while to realize it's always on yellow lane, for some reason. Not gamebreaking by any means, but it's an...
1. Melee Charge under the bull to fall through the map
2. Place door in the tunnels
3. Cart teammates/enemies there through another door and they're stuck
You can't get out unless you're Rem/Calico. Need to type kill/killme in console or have Dynamo Quantum you out.