6 mistakes

After reading an article about the 6 simple mistakes a director can make when making a documentary I've learned that even though your telling a documentary about a subject it must still follow a story. Another thing I've learned is that you need a great soundtrack the the audience doesn't become bored, confused, or displeased with your film, and lastly I've learned that documentary script writing must left last because you never know what you'll encounter during your shooting.I really enjoyed how informative this article was i also like that it was to the point and there were no long drawn out monologues. Are their any other mistakes that can be made? and if so what are they?