Alternative Character Interpretation: Brandon sudden character change in Camping. Did he do it because he knew that his jokes and quirks are slowly become stale as time goes on and decided to change into more serious and grounded person for the better or worse, or did he do it ironically just for shit and giggles like usual?
Doesn't stop him for returning back to his usual self though.
Base Breaker: Kitty's opinion of furries. He's constantly maiming at the fandom on his works, thought it's more of a Self-Deprecation joke than malicious ones. It doesn't stop him for receiving backlash from multiple members of the furry fandom.
He was previously involved in the community during his early teenage years, but decided to leave during his mid-teens because he thinks it's "just not for me". He also stated that he prefers the portrayal of the animals to be more cartoon-ish (as of 90's World of Funny Animals Cartoon-ish).
This has since died down by the time 2015 kicks in, and pretty much vanished by the time of his death.
Big-Lipped Alligator Moment: Some fans felt that the Dan and Chris skit from Camping are like this. They doesn't seem to contribute to the plot by much on that skit and it never brought up again.
The first minutes of Camping certainly qualifies. We don't exactly know why Roman Bellic ring the doorbell before Mr. Higglesworth comes in, and is never brought up again.
Colbert Bump: Many were first exposed to A Day to Remember upon watching kitty's content, especially this show.
Crazy Awesome: Believe it or not, Mr. Higglesworth is pretty much this.
Crosses the Line Twice: Mr. Higglesworth is the embodiment of this trope. Many jokes and snarks he quips that otherwise would be offensive for it's worth are so overdone that it became really funny.
Emo kid overdose himself to submission in Pep Rallies.
The attendance scene from Field Trips.
Ensemble Darkhorse: Elmer J. Fapp is a big example. He only has few lines that you can count with your fingers on his debut. Many liked his antics so much that eventually he became the mainstay of the main cast line.
Mr. Higglesworth is rude, sadistic, and a drugged man who has no problem of crossing the line like he care. Otherwise he is an exaggerated fit of stereotypical Sadist Teacher archertype that shouldn't even qualified as a teacher to begin with, yet for some reason many liked his skits and making him one of the most popular teacher character in the show.
It's not hard to see why many liked Elliot's Grandmama on her only appearance in Camping.
Growing the Beard: As the series went on, Kitty's skills in Machinima creation grows exponentially, with each episode felt distinct and more polished. Special mention goes to "Pep Rallies", where the editing is a lot tighter, the voice acting is more expressive, the comedy is more well placed, and introducing two more characters for the main cast line. And it's achieved within short time of 67 days!
Field Trips onwards, he starts to incorporate simple animations as replacements for the spaces used by records of flinging and wiggling ragdolls. The technique is to take screenshot of characters doing certain poses while constantly changing the pose to follow a set of movement, where it will be rearranged into much smoother animation in the video editing software. The process is pretty difficult and can be time consuming, but it's a worth of effort since it gives Kitty a better control over scenes and less relying on ragdoll flinging action. This trick carries well into his newer Gmod videos, most prominently Team Fabulous 2 and Mass Defect.
One-Scene Wonder: More like One Skit Wonder , but many liked Crabcore Kid's skit during Mondays.
The Scrappy: The Gym Teacher isn't particularly well liked. Unlike Mr. Higglesworth, his characteristic is as far as "ordering the students to do what he orders" and barely ever discipline them.
The Woobie: Some of the teachers, most notably Mr. Cool and Mrs. Person can be seen as this.
Ms.Person is pretty much the biggest woobie in this show. She has her voicebox broken that she has to resort on using text-to-speech program, and is hinted to have more disability than her broken voicebox (She seems to be tied on her wheelchair all the time, with the exception of that one time in Camping), and is constantly bullied and thrown around by Brandon. Not to mention that she is one of the few teachers who actually teaches the students in her class, and is one of the few teachers with a sense of responsibility, as seen during the field trip.