In the Engine Room on the last room, where you can pick up the batteries, I found an odd glitch that could help speedrunners. By pressing R at a specific spot after getting the metal box to the up right switch, you can jump on the box next to it, walk over and press R to finish the level without collecting the batteries. I did that exactly today, also did that on other playthroughs accidently. Here you can see it, you don't need the other two metal boxes. Next Sunday, you'll find my newest playthrough on YouTube (I'm not a speedrunner)

Happened at minute 1:26:00

And also here: