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It is revealed in this episode the Ice King was once a Human named Simon Petrikov who bought the ice crown and the crown's powers turned him into the Ice King.
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Princess Bubblegum returns to being 18 at the end of the episode thanks to the help of Finn and her candy citizens.
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It is revealed that Finn is thirteen years old after Princess Bubblegum is repaired for the second time and made younger.
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Why would the Ice King be asking Finn and Jake for blessings to marry Princess Bubblegum? The actual tradition is to ask for the PARENTS' blessings, not the best friends'.
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For the first time ever Princess Bubblegum gave Finn a kiss.
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Lady Rainicorn's parents wear speakers that translate their foreign language into English.
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Despite being a vampire not as flexible as his daughter, Marceline's Dad doesn't try to suck blood.
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Jake only makes a brief nonspeaking cameo at the end of the episode.
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In the episode "What Have You Done" during the scene where Princess Bubblegum is reading the book on Freezer Burn Flu, the numbers on the right side page (5318008) spell "boobies".
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In this episode, Finn is afraid of the ocean, yet in "Business Time", he doesn't show his fear. Also, at the end of "Memories of Boom Boom Mountain", Finn does show his fear when he is riding on the dolphin.
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Before Finn goes into the tower, Penny says that the only entrance was that window. However, when Finn goes out of the tower, he seems to come from a kind of back door.
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The translator has three settings: Old Man, Nightmare and Nerdy Alien.
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Chapter Five of the Enchiridion is "How to kiss a princess".
It reads: kissing a princess is different than kissing your grandmother or your mother... very different. A peck on the cheek is not going to cut it. Nothing but lip on lip action will suffice with a true Princess. It´s best to first practice on a lip monster, but proceed with caution because, as everyone knows, a lip monster can easily kiss you to death!
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When Pendleton Ward was trying to sell this as a series, he would present a storyboard for "The Enchiridion" to show that an 11-minute show can retain all of the elements of the original "So Random!" short.
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Marceline couldn't ride on a giant goldfish during the day because vampires die in the sunlight. The sunlight did affect her in "Henchman", so it could just be that she has a tendency to exaggerate, or it could be a continuity error.
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Although the Ice King has no dialogue, he makes a brief first appearance for the series in this episode.
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Goof: When the business men are etching Fin and Jake Adventuring Incorporated into their suitcases they forget one of the n's in Finn.