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For some reason, the word "Kuribo" is spoken as "Karubi".
Even though it's supposed to be midnight at the start of "True Colors", the background clearly looks like it's still daytime!
This is the second time I'm a Hurricane is played, thus making it the second song to play a second time in the series.
"In 7 Continents For 7 Koopas": When Mario restores South America to it's original jungle using the magic wand, Hop jumps up on a tree. In the next scene though, we see Hip that's there.
"In 7 Continents For 7 Koopas": When King Koopa tells Kooky to activate the Koopa Clogger, he says "With pleasure Pop!" and runs off. Bully standing next to him, moves his mouth with Kooky's lines, but no sound comes out.
"7 Continents For 7 Koopas" After the scene where Hop is assigned to south America, we see what it appears to be Hip and Cheatsy dropping to the real world. Cheatsy, however, already dropped to the real world moments ago.
Goof: In "Life's Ruff", the Lakitu that appears is riding a black cloud.
"Life's Ruff": Hip and Hop drive a blue sports car, but the TV reporter says that the car is red.
"Crimes 'R Us": When Luigi grabs the Fire Flower, he does not change color.
Why would fish-people live in a air-filled Atlantis-like dome? That doesn't make sense.
"Do the Koopa": How do Bully, Cheatsy, and Big Mouth cross the lava charmsh? They can't swim or fly!
"Do The Koopa": When King Koopa uses the music box, there is a glitch with one of the Mushroom People.
"Do The Koopa": The crank handle to the Doom Dancer is still in it even though Toad and Luigi had pulled it out at the end.
"For a first-time plumber's helper, you weren't bad yourself!" Mario tells Junior near the end of the episode. Why does Junior deserve thanks? Not only did he not do anything to help the Mario Bros. stop the volcano, but it's also partially his fault that they almost got killed earlier!
When Kootie Pie points the wand at the other Koopalings, Kooky has suddenly appeared in place of Bully in that one shot.
One of three Boomerang Bros. throws a boomerang at Junior. When Junior throws the boomerang back, they've changed into Hammer Bros.
The record that Mario is listening to is from "Crimes-R-Us'" Double Crossing.
In "Tag Team Trouble", when Mario and Luigi grab the Starmen near the end of the episode, their wrestling costumes mysteriously vanish. As if that's not enough, they stop flashing right when they jump in the ring, but continue to be invincible (as evidenced by the music).
"Reign Storm": When Koopa hides behind the throne, the robot Princess has a crown on her head, even though the real Princess has it. Not only that but when Kooky comes back, he hits the robot Princess and knocks its head off. Then the head disappears in the air.
"Toddler Terrors of Time Travel": Kooky says that they (him and Koopa) will arrive in Brooklyn on a day in 1983 "just before noon". When the Doomship does land in Brooklyn in 1983, however, the clock reads 2:00 P.M.