ok, i checked on those four stories. snopes.com says that the accusation of staging a Harvey flood rescue is false, and their analysis seems valid. the person who shared the debate topics with Clinton ahead of the debate was actually a DNC official. the story about cnn making and retracting a report on a scaramucci-Russia link is true. the claim about cnn blackmailing a reddit user, and whether that user was just a kid or middle-aged, hasn't been confirmed or refuted by an independent source as far as i can see.
so there seems to be some real mismanagement at cnn, but also some misrepresentation by pro-Trump forces. always best to check!