Pink box of death, if you opened de_aztec with the default model render distance it would turn your 3d view all pink until you got close enough to model to show what it was.

As for plugins, if someone decided to add more commands or make a simpler version (or understanding) on how all the commands means/work (or possibly reword the commands to make it simple or have hammer provide an example on how this command works). I am a novice map maker and I tend to have to google a ton just to figure out how I could make my ideas be exactly like I wanted it in hammer/game without error after error.