For example, in the break room, underneath (actually colliding into) the soda vending machine is an orange soda can. It’s on the left or right bottom corner.
I suspect that there are two monitors in this spot: the security room in the box jumping crane room. in this screenshot, because it (and only it) flickers very rapidly.
Missing textures?
Same room as above, the shorn end of a girder seems to be missing some texture, as circled:
Hall of Mirrors effect here, that scene where a scientist gets pulled into a vent:
Exterior: