Most of my favorite YouTube series are about movies: pointing out inconsistencies, illogical points, and other humorous bits. This works well for me because it teaches me about stories and plotting, using something awesome! Screen Junkies is one of the YouTubers that does this. My favorite series by them is their Honest Trailers.
To create the Honest Trailers, Screen Junkies takes movies suggested by viewers that have come out on DVD already and create a trailer of how the movie "honestly" is. Naturally, they are very sarcastic, but they make some good points. Below is one of my favorites of theirs, the Thor Honest Trailer.