Stumbled onto a way to clip onto a rail in my casual playthrough. Going out of bounds here can skip a couple of minutes worth of cutscenes.

/static/blob/rnq36xzj.mp4

[edit: looks like video uploads still don't work on SRC.

Interesting! Have you managed to go out of bounds somewhere else?

I played around with it a little more, but I only managed to do it in one other place once. I got on top of some useless object inside Graham's apartment building.

No clue how it works, honestly. Maybe you need to walk into a corner? I'm just trying to stop in front of the rail and sometimes it works.