WARNING: Untagged spoilers ahead. Read at your own risk.
- The way Thomas speaks as each Sanders Side is especially worth mentioning. Each Side has his own unique voice:
- Logan is clear, eloquent and just a bit monotone.
- Roman speaks with a loud, boasting, dramatic voice befitting of a prince in every way.
- Patton's voice is bouncy and energetic and cheerful, just listening to him brings a smile to your face.
- Virgil is low and biting, within the register that makes his voice gravel.
- Deceit speaks with a voice that sounds smooth but poisonous, like oil or tar.
- Remus has a high-pitched, off-kilter voice that sounds as demented as he claims himself to be. It is also slightly raspy, similarly to works in which people don't use Hatsune Miku right, making her too high and screechy. All of this fits how he's the subversion of something that should be good.
- Additionally, every side has very distinct body language. This is especially obvious in how each side takes the stand in Selfishness v. Selflessness. Deceits every movement is serpentine and smooth, while Logan holds himself tightly, Patton moves with visible glee, Roman telegraphs his movements like hes on stage, and Virgil routinely slouches. Remuss own movements are very sharp and jittery, as though hes making a decision to move just before he does so. Its very clear to tell who is talking even if their appearances are different than usual.
- When you re-watch "Accepting Anxiety" and realize Deceit's existence was foreshadowed almost six months in advance. Just look at the Oh, Crap! look the Sides exchange after Roman suddenly claps a hand over his mouth... an action which, we now realize, probably wasn't of his own volition.
- The rap battle between Roman and Logan. At first it looks like Roman has the victory in his pocket, and then, cue Logan. During the latter's rap, the camera switches to show the expressions of the other Sides from time to time, including Roman, Thomas and Patton staring in confusion at each other before the latter and Virgil join in the fun. It ends with the creative Side in Stunned Silence. This as well as this shows how many people in the fandom know the words by heart.Logan:Stricken with clairvoyancy, events occured as I'd foreseenYour verse was weak, your rapping stinks, flamboyantly employing theseTrisyllabic rhymes, PSSH! I can match that easily.I'll beat you everytime, so you do not want beef with me, Princey...I drown out lesser emcees when I flow, there's no avoiding me...Under pressure I rise up - Holler at your buoyancy!I had this battle on lock like Attica!I claimed to be the better bard and I backed it up!
- This becomes Awesome by Analysis when you dissect the actual poem.
- In "Accepting Anxiety: Part 2", after one too many Open Mouth, Insert Foot comments from Roman to Virgil, Thomas bluntly tells him to shut the hell up. It's one of the only times we've ever seen Thomas put his foot down with the Sides.
- The entire ending of "Can Lying Be Good?" is awesome. After an entire episode of "Patton" acting weird, he finally lets the mask drop, and Virgil comments he knew something was up. Logan begins to say something — and then "Patton" waves his hand and forces Logan to shut up. Suddenly, Roman gets it, too. But Thomas doesn't, and Virgil explains that there are certain aspects of himself he can only know about if he wants to know. "Patton" taunts him, breaks out a Nightmare Face and warns him that Thomas won't like what he finds, but Thomas tells the others to tell him. Logan, now free to speak, screams out, "DECEIT!" And "Patton" vanishes, and the audience is formally introduced to Deceit for the first time. Everything about it, from the build-up, to his snake-like makeup, to the genuine threat he poses, to his creepy musical theme, is awesome.
- From the same episode, Logic's little Battle of Wits with Deceit, best summed up by these two lines.Deceit: What you don't know can't hurt you.
- While a comedic villain, Deceit has a wonderfully chilling line in "Selfishness v. Selflessness" as he describes what his purpose is and why Thomas needs him. Thomas's delivery of the line makes adds a great sense of menace to the character.Deceit: I don't want Thomas to be disadvantaged in a world where you can die for not following the laws made in the name of a lie.
- Logan's ability to No-Sell Remus's violent acts against him in "Dealing With Intrusive Thoughts."
- As revealed in the 4th of July livestream in 2019, Remus was created more than two years before his debut. The first conversation Thomas and Joan had about Remus was while they were filming Growing Up, which was filmed around April 2017. That's 26 months before the character saw the light of day. Remus was the first of the Dark Sides to be created. Inside the team, he became deeply attached to Joan, as they were the one developing his quirks, rehearsing and rehearsing lines while giving life to the character. Even though Thomas played the first public version of the character, it felt for him like an impression of Joan's Remus and he had a high sense of responsibility to live up to their portrayal of the character.