Conspiracy Theorists, especially in the video about Justin Bieber being a reptile person.
Vine stars like Zach King.
Big-Lipped Alligator Moment: At the end of the Russian Ghost Car Debunk Captain D starts talking about Vladimir Putin and the Illuminati. He starts speaking in a weird demonic whisper and then the footage cuts out before cutting to Captain D doing his normal farewell as if nothing had happened.
In "The Undebunkable", Captain D gives an uncharacteristically direct and passionate talk about the importance of not thinking everything is fake. Seeing as how his whole shtick is debunking fake videos, it can be easy to fall into Arbitrary Skepticism at anything that looks even a little unbelievable. He stresses critical thinking, not cynicism.
Similarly in "The Mandaellah Effekt", he and Holly!Captain thoroughly explain the stupidity of using the Mandela Effect to form conspiracy theories about Alternate Timelines because skeptics want to feel special, or deny historical facts because "it's just interesting to think about."
Captain D: Being fascinated with a quirk of the mind is great, but if your explanation for it blows right past Occam's Razor to "inter-universe leakage", it's kind of a problem for the rest of us. Holly!Captain: It encourages sloppy, uncritical thinking, which is never a good thing. Knowing how to distinguish what you think is real from what is real is the most important skill in the universe. I'm saying that, and I'm an actual goddess.
Visual Effects of Awesome: Helping demonstrate Captain D's knowledge of visual effects, the show has very high production values, great CGI and other visual effects included, often times being able to directly replicate the effects in the videos he debunks to demonstrate how simple they can be.