One thing that founders forget is that after they hire employees, they have to retain them.
Move fast. Speed is one of your main advantages over large companies.
Every thing at a startup gets modeled after the founders. Whatever the founders do becomes the culture.
You want to continue to be run by great products, not process for it's own sake.
You have to be intense. This only comes from the CEO, this only comes from the founders.
If you ever take your foot off the gas pedal, things will spiral out of control, snowball downwards.