They're both unintentional, in both occasions the object defies the laws of physics (going through walls? oh please) as, ironically, a result of the game engive trying to resemble a true physics model.

Sometimes though, unintentional bugs can be implemented into gameplay in future releases thanks to the community adapting to it. I think a classic example of this is the rocket jump (if you dont know what this is then you don't deserve to call yourself a nerd, SHAME ON YOU!). I doubt that in doom or quake (not sure where it started) the developers had this great idea to make rockets blow yourself up into the sky, some gamer prolly figured it out until later it got implemented into later games.

Hmmmm, speaking of weapon jumps, you guys ever seen half-life (yes the original game not counterstrike or anything) duels? WHOA! Talk about overkill! The things that plasma charger thingy can do!

So yeah, both are unintentional, and theyre still around thanks to JJ2 not getting patched. I wonder if the 1.25 patch actually fixed up those issues or not, makes me kinda nosey.