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Remembering the first episodes of the show, Ickis had glasses (which inexplicably disappeared). However, in the flashback episode, he has no glasses. Also, it's interesting to note that during their first days, Ickis resembled the current Oblina, Krumm resembled the current Ickis, and Oblina resembled the current Krumm with all of their personalities.
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The chase ends at the dump, where Shorty is finally caught and taken back to Bates County Prison.
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When young Gromble blows on the board to remove the stamps of the heads, they are gone but in the next scene with the board, they're back again.
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At the beginning of "Out of the Past" when The Gromble is shown talking, all the rows of seating behind him (including the viewfinder) are empty. Later in the scene, students appear in other rows, and when class is dismissed and Ickis is still seated at the viewfinder, you can see several students around him get up from their seats and leave.
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When The Gromble has Ickis zoom in and freeze frame on the picture of the car, you can see the front end of a red car pulling in front and Ickis as he turns the corner of the fence. A second later, however, when you see The Gromble standing alone looking at the screen, Ickis and the red car have disappeared.
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In QFTHP, when the scene cuts to the classroom after Ickis embarks on his quest, you can see Ickis in his seat.
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Apparaently monsters are very sensitive to anesthesia, because when they inject Simon with the anesthesia, Ickis falls asleep just from touching it.
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Slickis was terrified of geese as a child.
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In the monster world, the term "Era of Disbelief" is used to refer to World War II.
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Apparently monsters reproduce by touching fingertips.
A baby monster is called a blob which then hatches into a "bonsty"
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When Krumm gets trapped in midair, Ickis is panicking about how they're going to get him down. Why didn't Ickis just make himself big and cut the rope open with his claws instead of flying in a toy airplane?
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The songs that Zimbo and the Snorch sing to torture Ickis, Krumm and Oblina are "Ah, Sweet Mystery of Life" from the operetta Naughty Marietta, and "La donna รจ mobile" from the opera Rigoletto.
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The kid who asked for toilet paper is the same kid seen in the background dancing.