These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Crowning Music of Awesome: While they're usually played in reverse, many of the song choices in the Observer's videos qualify as this.
"Interception" uses a reversed version of Pendulum's "The Other Side". Word of God states that it was chosen not only because it fit the subject matter of the video perfectly, but because it's one of the creator's personal favorite songs.
The video also utilizes Gotye's "State of the Art" and Boards of Canada's "The Devil Is In the Details".
"Funny Aneurysm" Moment: Happens in The Live Stream Incident. Around 3 minutes in, Noah points his camera at his streaming webcam and laughs that he's recording himself. 19 minutes in, Noah somehow sees another version of himself in his room recording him. It's Firebrand.
Word of God in this interview is that the series originally started as an homage to Marble Hornets; after it was posted on UnFiction forums as a side-story and was criticized for being too similar to MH, Adam (Noah's actor) decided to expand the series to avoid having it go down in infamy.
And as of Unknown Caller the same cell phone has gotten much, much worse, having received a call from someone or something despite having no service. The incident freaked Noah out so much that he destroyed the phone, one of his only leads.
Any "vocalization" that either Slender Man or the Collective members make. It's a good way to tell they're not human.
Ho Yay / Foe Yay: The Observer writes on Noah's bare stomach. And strokes his face.
He claims to have "taken quite a fancy" to Noah in INTERCEPTION. *shudder*
Idiot Plot: So, your friend is in town, who you've not seen in months and won't see again for months. You've only got a few days to spend together. However, you have a real jonesin' for some Doritos. Naturally, you leave your friend (who's of course shown signs of being paranoid and possibly delusional) alone, at your house, with no mutual friends or family members to hang out with, rather than go to the store together. Oh and sure, leave him with your camera too.
The Thanksgiving episodes are even stranger. For one thing, why is Noah spending Thanksgiving with a strange "fan" rather than his family? And why would any "fan" who watches his channel and sees the shit going on in his life EVER want to be anywhere near him? And why did she never bother to ask anything about the mysterious events in his life?
Him not visiting his family could be as simple as the fact that Noah is an adult and lives a decent distance away from his parents. No mention is made of any other close family (in terms of relationship or distance), so he probably didn't have any relatives to visit. As for visiting a fan, maybe she took pity on him and mistakenly thought there would be safety in numbers and distance, since Noah has only before had encounters when he was alone or with Milo in and around the park and his house.
I Knew It: "The Live Stream Incident" confirmed what the fandom had suspected for months: Firebrand is a future version of Noah Maxwell who has been inducted into the Collective.
Narm Charm: Noah's constant cursing sometimes feels more like an endearing character quirk than bad acting. "Fucking fuck!" That's our Noah! In fact the series as a whole could be seen as this for some of the fans who really love this series.
In November 11th, we see the Observer's face. That's all really creepy, until you realize he's been wearing zebra-print glasses this whole time....
Paranoia Fuel: After Night Recording, Noah no longer feels safe in his own home. Odds are, you won't either.
November 11th: The Observer's face appears under Noah's bed as he is captured. Have fun sleeping!
Mary Asher Phone Call cranks the paranoia Up to Eleven. What's worse than having a cadre of Slenderminions stalking you? Finding out that they've been monitoring your every move throughout your entire life. By the way...they're in your house right now, watching you as we speak.*shudder*
HELLOTHERE is pretty damn reminiscent of totheark's Entry ######; it's a strange and ominous black-and-white video posted on the protagonist's account, telling him to do stuff and threatening/warning him.
Taken Up to Eleven in Unknown Caller, which gives probably the best shot of Slenderman's tentacles of any series, with very fluid motion I might add. We don't get to see his main body, but that arguably makes it scarier.
HELLOTHERE has a visual style reminiscent of A Scanner Darkly. Slendy shows up in the last second of the video. Just to say "we are always watching you Noah". It is terrifying, as well as impressive.
The Ultimatum video from The Token Letter seems to be from the same person who made HELLOTHERE and looks just as good.
And COMECLOSER continues with some frighteningly impressive video effects.
Nature Trail Visit was one of the Most Triumphant Example for this series. No less than FIVE shots of Slendy with tentacles waving everywhere.
November 11th has a great shot of Firebrand that shows us that members of the Collective are always shrouded in darkness.
Mary Asher Phone Call ramps up the standard even higher with Slendy's Flash Step.
The 11-11-12 Livestream gives us the Mind Screw of Noah filming his future self right before the timey-wimey ball starts getting batted around.
Kevin, too. During a moment of clarity he writes a letter to Noah begging him to kill him so that the Observer can't use his body anymore. The Observer doesn't even let him take the pencil off the paper before having the last "Kill me" lead into a crude sketch of an Observer trollface.