Watchmen Easter Egg - 300 Reference

In the opening scene where the Comedian is confronted by an anonymous villain, the Comedian throws his coffee cup at the villain, but it misses and hits the door. The Comedian's room number is 3001, and the coffee cup hits the 1 on the door, causing it to fall off. The number on the door is now "300", which is another movie that Zach Snyder (the director of Watchmen) directed.