By complete accident on my last PB I realized that you could slide off one of the elevators with the dialogue prompt up. I was going fast so I didn't have time to experiment, but it seemed like an odd quirk that might be exploitable. Decided to sit down with it today, and found that you are able to diagonally slide off this elevator by doing so and squeeze into a passage you're not supposed to be able to access, saving about a minute and some change because you don't have to unlock the blue and red gates in order to proceed.
Skip happens at about the 30 second mark.
You may all bestow me with proper admiration. Thanks in advance