Hismoniker. As of the Mister Lonely review, he's dropped it from the title sequence and goes by just his real name.
Kyle's expressed regret about his Primer review, feeling he was way too hard on the film.
He also turned against the Spring Breakers episode just a day after its release, admitting it wasn't his best work. While he considered doing a follow-up video to it, Kyle eventually decided on just covering those aspects next time he reviews a Korine film.
Kyle's largely turned against his pre-Melancholia reviews, feeling he was trying too hard to be funny over being informative. As such, many of them now have disclaimers saying that the video is "a work of satire and does not reflect the critical opinions of the author".
Eloquent In My Native Tongue: He admits that he's not all that skilled with Dutch, although he has some knowledge; he spent part of his childhood in the Netherlands and even went to an international school there.
His review of Nightwatching/Rembrandt's J'accuse opens with him addressing the viewer in Dutch, until the cameraman (actually his brother) cuts him off complaining about his terrible accent.
Fandom Nod: The Origin of Escargoancitizen, a live-action fan fic about Oancitizen turning into a snail, which was written In the Style of...Uzumaki. Escargoancitizen has also made appearances in few other places, including a cameo in To Boldly Flee.
Missing Episode: The sans-commentary version of "The Girlfriend Experience" (which he felt completely misrepresented him) and "What Is It?" which got removed after Crispin Glover took umbrage at its existence.
Old Shame: When he posted the old review of The Girlfriend Experience on TGWTG, some comments came in, which he agreed with about the review coming off as Slut Shaming, and he contemplated removing the review altogether. He did say the intent wasn't to mock Sasha Grey for her adult film work, but the message he meant didn't come across clearly.
Red String of Fate: Kyle and his artist discovered only AFTER they agreed to work together that his artist lives only 4 blocks from him. They've since become not just coworkers but inseparable best friends, to the point of people thinking they're dating or even joking that they're married.
Kallgren stated that, at one point, he thought of being an actor.
During the break between Melancholia and Mister Lonely, Kyle suggested a temporary series where he would rewatch the films he reviewed early on and recap them with a new perspective. He eventually discarded that for a new Between the Lines.
There was going to be a joke in the Mister Lonely review involving the scene in Grizzly Man where Werner Herzog listens to the recording of Timothy Treadwell being eaten, only with the audio replaced. Kyle ended up cutting the gag out.
Another canceled video was one where Kyle would review Citizen Kane while drunk. In his own words, "getting sloshed for a joke just came off as sad the more I thought about it."