Get Out: Said in Tumblr after the narrator questions if the peg is a white cisgender straight male (a parody of social justice warriors).
Gratuitous Japanese: Parodied in DeviantArt, as the narrator states that the site has its own language program, where you can learn words like "desu", "kawaii", "sugoi", "nii-chan", "neko", and "waifu":
"...which all roughly translate to FUCK OFF."
Gross-Up Close-Up: One section in Tumblr has a penguin trying to convince others that it's going extinct, before revealing that it was a lie:
"...but one day [cue close up]IT MIGHT NOT BE."
Hermaphrodite: A peg in Tumblr tries to claim to be this by slapping a picture of a vagina over his crotch. The narrator tells him that the term is racist (somehow), telling him to call himself "vagin-abled" instead.
"Do you worry about tests sometimes? You have ANXIETY DISORDER! Do you touch the doorknob before opening doors? Then you've got CRIPPLING OCD! Do you sometimes itch yourself in public? Then it looks like you're TURNING INTO A WOLF!"
Lame Pun Reaction: The narrator in Tumblr recommends pandering to a fandom - or "pandom". Cue several "boo"'s flying across the screen.
The peg modeling the fashion blog in Tumblr is clearly modeled after Elsa from Frozen.
A segment in the same animation about shipping uses the Once-ler from The Lorax as an example.
The first character used for an ask blog is Bubbles.
Another segment involving fandom shows a peg dressed as Monkey D. Luffy, the protagonist of One Piece.
During the fandom montage the narrator mispronounces "Attack on Titan" as "Attack on Titania," represented as little dots attacking a giant Titania from Fire Emblem Tellius.
The peg with the pink afro complaining about conforming to gender roles is clearly a magypsy from MOTHER 3.
Twitter has several, usually hidden in the hashtags.
The chalkboard outside the lemonade stand has a sign advertising "lemon-gren-ades."
The hashtag "Get Jiggy With it" literally features a peg dancing with two jiggies from Banjo-Kazooie.
At one point Danny Phantom is featured coming out of a woman's locker room.
Take That: The videos are mostly made of these towards popular sites and users.
DeviantArt mocks people who overuse Japanese terms, inflation artists, and shippers.
Facebook mocks people who whine about their (very simple) problems on Facebook, along with people who take bad photos and don't admit it, people who friend people they barely know and refuse to unfriend anyone, and people who misuse the site in general.
YouTube mocks people who make comments about the like/dislike bar, comments that say "Thumbs up if [X] brought you here", users that upload certain types of videos, and Youtube's copyright system, among other things. Specific channels that get a Take That against them include Fred, The Annoying Orange, Pony.MOV, Ray William Johnson, and Pew Die Pie.
Twitter mocks the site as a whole, especially its userbase.
Tumblr mocks fandom, night bloggers who post flame baity things, people who reblog important causes without seeing if said causes are real or not, and especially the traits of social justice warriors.
Take That Me: Youtube jokingly suggests making an Abridged Seriesas a way to attract attention from the anime community. The narrator then sarcastically says "Those are always a success!," providing a link via annotation which reads: "What loser would even try something like that, am I right?". The link leads to Jello's own Abridged Series.