I was just playing around and I found some bugs.

First Bug: You can get into the elevator with the guard that dies. Second Bug: You can touch SCP-1123 through the glass if you're standing here: Third Bug: I was at the checkpoint between Heavy Containment and Entrance Zone. I opened the door to go to Entrance Zone and walked five feet and boom, SCP-066 says "eric" and plays his song loudly. Turns out he was in the next room, but I hadn't even encountered him yet. No video of it because I don't have a video recorder.

Fourth Bug: Game failed to load GFX\items\docRAND3.jpg
Note: I do have this jpg in my items folder. Edit: Not sure if this is a bug but when you finish 1123's hallucination thing, you will just be shown crouching forever without any notification that you are injured until you use a First-Aid Kit.

I can confirm the first 2