1. Rigby was supposed to have a tie but it was too much hard work to animate
Ah, he doesn't need one anyway!
2. Regular Show was originally going to be called 'The Normal Show'
It was going to be based around Mordecai and Rigby working in a zoo for humans
3. Each episode of the Regular Show takes about 9 months to make
4. Skips is the only main character who has 5 fingers
...everyone else has 4!
5. High-five Ghost has a brother called Low-five Ghost
6. Rigby has masklophobia - a fear of masks and mascots
...it's a real thing! Poor guy.