Cerebus Syndrome: Both The Last Scene and New Prime start off as a short, nonsensical dialogue in minimalist settings. By the end New Prime actually somewhat serious, has Character Development, and Plot Twists. It never loses its humor, though. The Last Scene plays with and zigzags this, and seems to settle on Indecisive Parody.
Mr. Imagination: Daniels, apparently, having made up multiple people, including his dead girlfrend and Satellite Love Interest. He was possibly lying, however, as Carl was shown to actually be real in New Prime 5. It's very possible that Shelly was real to.
Narnia Time: The year-minutes or yeuts. As well as The White Void.
Back from the Dead: When Ferris destroys The Lost Gate, Dutch, Lightwave, Brenda, Daniels, Scar, Hans, and A-jacks, emerge. Subverted for Daniels and Scar, who end up getting disintegrated again when the Void explodes.
Emperor Laboosh's "I'm feeling frazzled" and its variations, as well as Valavingee's "I have dealings".
"Rev it down, Dutch!"
"Calm your storm!"
Cerebus Syndrome: Begins to kick in at the end of the second episode, but never goes all the way until New Prime 5.
Cliffhanger: At the end of New Prime 5, we don't know the fate of Ferris. The series ends after he falls out of Zack's ship as Valivingee watches the void exploding from space, while Pheonix Gold narrates that a new scene is about to begin.
The teleportation sound effect is shared by Bob and The Phantom.
Hans referring to Zack as a Gargoyle is this to the fact that Zack isn’t just a crossover character, but that New Prime is in the same universe as The Last Scene and that the Gargoyle wars have already happened.
Everyone comes Back from the Dead (save for The Phantom) in New Prime 5, but it's Double Subverted for Scar and Daniels who end up getting killed with the explosion of the void, and Ferris' fate is ambiguous, but he's implied to have died when he fell out of the ship.
The Mole: Bob is revealed to be The Phantom in disguise in New Prime 4.
Mind Screw: Both in and out of universe. In-Universe, the organizations of gates in New Prime. Out of universe, New Prime 4.
Mood Whiplash: Once Cerebus Syndrome starts kicking in, this is to be expected. Particularly the different conversations in The Lost Gate in New Prime 4.
Narnia Time: The Lost Gate takes Ferris to The White Void from The Last Scene in New Prime 4, where it’s revealed that Daniels had been missing for years, despite that he’d only been there since the beginning of The Last Scene.
Wham Episode: New Prime 4 reveals that The Last Scene is actually in the same universe, Daniels is Ferris’ brother, Dutch was killed by The Phantom, and that Bob is The Phantom in disguise, before which The Phantom gets the last of The Pieces Three by fooling Ferris while being Bob in disguise.