These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Na No Wri Mo
Hilarious in Hindsight - Typos, grammatical errors, and other flubs are lovingly christened as "Nanoisms".
Memetic Mutation: Persimmons and "perma-persimmons" originate from a misspelling of "permissions", meaning to allow independent NaNoers to publish select Nanoisms in print.
Not to mention the "plot ninjas" and "plot kittens" that everyone decided they liked better than plot bunnies.
Padding - As mentioned above, there are many, many ways to inflate one's wordcount without necessarily contributing to one's plot development. Such as:
Removing contractions ('do not' vs 'don't').
Giving characters multi-word names or fanficul titles and insisting on a Full Name Basis (or simply repeating them often).
Having a character sing along to a song on a radio, or recite lines from a play/novel/movie.
Giving characters particular Verbal Tics, like stuttering, to up your wordcount. (paraphrased from No Plot? No Problem! "Give your character a stutter! Not only will it allow you to double all their dialogue, but everyone else in the story can spend pages wondering where the stutter came from!")
"Never delete anything. If you can’t stand to look at it, just change the font to white and keep going." (from a 2011 pep talk by Erin Morgenstern)