You should have taken your English teacher seriously.
i've watched a ton of them with my friends b/c they're fun to make fun of....it's really hard for me to imagine anyone taking them seriously
I see only 3 mistakes. Not too bad. Also, he used the proper "they're", so that's plus 1 point. The only thing that's weird is how long it takes to type 'b/c' instead of 'because'. I can get 'because' out there faster than having to reach for the '/' and type 'b/c'.
Anyway, yeah, the videos are pretty corny.