Bugs/etc
- Flying corpses & monsters
- Trick!
- Floating brick
- Why open door when you can jump?
- Earth-walkers
- Ass-crawling corpses
Flying corpses & monsters
Hmm?

What is this?

Oh look, Protectron! Wtf?

Hel-lo there!

Kung-fu dog

Trick!
Nice friends you have! (made so to have him nuke Behemoth and not you first, I guess)

Floating brick
Look! No hands!

Why open door when you can jump?
Looks like level glitch - jump on some tubes, then on some boxes, and you can use computer in another mid-jump without unlocking the door to it
Earth-walkers
Brotherhood patrol entrenched on a bridge

"Whatcha looking at?"

Charon just cannot exit buildings normally

Ass-stepping corpses
If you shoot mutant on the ladder and it stays in more-or-less one piece, and falls on his back, he will crawl down by stepping from step to step... on his ass.
Unfortunately, no game video, but I made a sequence out of screenshots.
Video; Source shots