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!"
Inherently Funny Words: Duck Fayce's "QUACK!" in the Facebook video gets funnier every time. Especially because it's an adult man's voice attached to a 13-year-old girl.
Lame Pun Reaction: The narrator in Tumblr recommends pandering to a fandom - or "pandom". Cue several "boo"'s flying across the screen.
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.
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.
invokedMost of Vine consists of Jello himself talking to "Joe" and taking the piss out of his own commenters and their suggestions for future videos.
Take That Me: Youtube jokingly suggests making an Abridged Series as 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.