Yep, happens all the time when Im trying to run away from people. I've ran through fences, doors, even walls. This is also how people glitch through the walls in buildings and get in inaccessible rooms.

*seems to happen more when my frame rate isn't so good.

Can confirm. Sometimes I drop things and they never reappear. In the firehouse for example, objects i drop on the second floor will reappear on the first.

i agree, the white and black is overly exaggerated.