1) "(Nice comment about the video) I subbed" ....... Doesn't sub
2) Sub4Sub
3) Challenge, Tag, and React videos are what get views.
4) (this one I felt I had to elaborate on) When people say they also have a "Comedy" channel when in reality they just are funny. Like by Comedy channel, I mean I make jokes. My channel is based around being funny and making jokes. If you're a Gaming channel and you just so happen to be a funny person, I don't feel you should be calling yourself primarily a Comedy channel.
5) When you do a collab with someone and they don't put ANY of your links in their description.