Some of the other stuff I found a couple of days ago:
During the Homeless fire you can also break both stair triggers and go downstairs and upstairs whenever you want. Unfortunately the escape trigger upstairs isn't activated, so you can't use that to end the chapter early. Instead you just walk around in an OoB area.
Also in The Mission after you skip the cathedral cutscene there are, as already mentioned, multiple triggers preventing you from going through the cathedral early. Instead you have to enter the house and watch the flashback to make them go away. Since those triggers are again one directional (meaning they only trigger when you face the cathedral) I managed to get this far without activating it:

You simply walk through the trigger from the right side facing away from the cathedral, so it won't activate. Their triggers are always limited in height, but unfortunately this one is high enough to cover the entire area up there as well. You activate it as soon as you turn around, so this is useless for now.
During the Homeless fire you can also break both stair triggers and go downstairs and upstairs whenever you want. Unfortunately the escape trigger upstairs isn't activated, so you can't use that to end the chapter early. Instead you just walk around in an OoB area.
Also in The Mission after you skip the cathedral cutscene there are, as already mentioned, multiple triggers preventing you from going through the cathedral early. Instead you have to enter the house and watch the flashback to make them go away. Since those triggers are again one directional (meaning they only trigger when you face the cathedral) I managed to get this far without activating it:

You simply walk through the trigger from the right side facing away from the cathedral, so it won't activate. Their triggers are always limited in height, but unfortunately this one is high enough to cover the entire area up there as well. You activate it as soon as you turn around, so this is useless for now.