1. Not using a Tripod
2. Putting your finger over the lens
3. Filming w/background noise
4. Not storyboarding before shoot
5. Forgetting to charge your battery
6. Using too much or too little light
7. Not preparing actors before filming
8. Trying to do too much w/your film
9. Improper use of the microphone
10. No location scouting before filming