This game has 2 game-ending glitches. 1: After the phone call where I got the photo, he kept teling me to come back here, over & over again and I couldn't move.
2: I tried using the crowbar on the grate, then the belt itself, and now for some reason I can't get the key with the grapple hook. http://i.imgur.com/5M4EU7J.png
Cyberjar88
The Easter Egg was thoughtfully hidden. I say that because I thought to myself "I wonder what will happen if I do this..."
solarVagrant
Yup, that was the idea!