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.
There's one comment on The Justin Bieber Show that analyzes the symbols and makes that animation even more disturbing: "The crow represents the paparazzi, constantly butting in. The termite king stands for the music industry, how they want his albums to eat through all the other artists'. The hobo represents Justin selling his soul to the "Hollywood Life" and never being able to be a normal kid again. The bees represent his fans and how sometimes they can become too much. The dead baby represents his dead child hood. The faceless man represents how Justin's face will never again be his own." This was pretty much debunked however, by Harry himself. His response to this was 'No, it's pretty much just a random cartoon'.
Don't let the Watchmen parody's Saturday Morning Cartoon exterior fool you. If you go into it with a decent knowledge of Watchmen's story, it's actually really dark.