At the start, when you go to the Personal Facilities to get into your uniform, go to the restroom stalls. One will be locked. Activate the noclip code and go through the door. Look at the back of the door. One of the game's programmers will be pictured there. This occurs again after you and Dr. Rosenberg go down the elevator. At the room where you some out of the elevator, there will be a fallen vent. Once again, enable the noclip code to go through the vent. At the end of it, you will see the same image.