I had no idea what the whole Gak and Season 3 premier joke was about, that was until i watched "Bronies React: Season 3 Premier" Video and saw that the Gak commercial used over and over again during every commercial break XD
In the Season 3 premier there were TONS of Gak commercials, they usually played right after the last one, making 2 Gaks in a row. I don't know the exact number of commercials, but I can tell you it was ALOT. It was kind of annoying, but hilarious what everypony's doing with it XD
Those people are Amber Fredman-Tarshis (chief marketing officer) and Brooke Goldstein (senior vice president of ad sales) (not to be confused with Brooke Goldner, voice of Rebound on Pound Puppies and the daughter of Hasbro CEO Brian Goldner).
I don't see why, commercials have been airing a lot on the Hub since summer started, I learned to tune them out. Then again, I was paying more attention to the Dan Vs Season Three and Pound Puppies "Name a Puppy" commercials. Bronies make memes faster than 4chan.