A bunch of stuff I figured out by exploring and no-clipping around a lot when I couldn,t figure out anymore.

If you wander about long enough during the office exploring section, you'll eventually run out of battery and be stranded without power.

In the ending with the outdated printer in the basement, once you go back down after trying the keycard, there's a door that's normally locked, keep trying it and eventually it will open... and so do the other doors after. at the end you're almost free but then run out of battery leaving you stranded without power (again).

In the beginning, if you go on the platform that lifts you up to the next part of the map and then attempt to jump back on the conveyor belt, you won't be able to go back on it but you might be able to get yourself under the lifting platform. Doing so fails the quality assurance test and gets you thrown in a trash on the same map with unique interactions.

This guide was written a long while ago so I don’t remember exactly how I found it, but just keep wandering in different places and I’m sure you will find it, if I remember correctly it’s in the part where you are timed and if you don’t escape in a certain amount of time then you are forced to get that ending (I think)

I still can't figure out how to do ending 4. I jump off to miss the lava, but I can't figure out what defective electronics you're talking about.

I have found the keycard, it is in Building Owner - Mrs. Helen Fisherson's room, on top of the table.

It’s the night where you can wander the entire office grounds, just keep playing the game and cleaning the office till you are able to explore

what in the world is the freeroam section and how do I 'access' it

I found a secret ending by managing to fall off the elevator platform at the very start of the game, leading to my character waking up in a dumpster, I won't tell anymore information though.

There is a secret area when you fall down the lift shaft at the start on the conveyor

Alternate ending 6: in the rainbow obstacle course, Die 30 times, Then step onto the blue platform

Mafeuso gave me the info I needed here.
The restart ending mentioned by Rodomify might be worth including if yo are already making changes.
It might not be a ending but still nice part of the game to see.
Probly would want to make clear its not a actual ending thought.