Blue Wants to Play a Song Game - S1-E14
Revealing mistake: After Blue and Steve play the monkeys jumping on the bed game with the sock monkey, when the mail time song plays Steve gets up excitedly and his arm and hand get cut off.
Robo Koopa - S1-E52
Revealing mistake: When Bunsun walks up to Dr. Nerdnik to free him, an animation mistake is noticable. Bunsun is far away and she walks up to him, and during this whole sequence her body is in front of Dr. Nerdnik, according to the camera's view. (00:04:55)
Featherwand - S2-E3
Revealing mistake: When Chilli and Bluey both run down the stairs before the ball catches them, if you look closely when Bingo turns her head around, her mouth is completely glitched for a split-frame.
Heart of Ice - S1-E3
Revealing mistake: When Batman - disguised as a security guard - opens his utility belt, the belt opens and shows a configuration of buttons and a split-second later, a key card materializes out of thin air in front of the buttons. (00:11:30)
Revealing mistake: Right after TJ and friends are looking at the "thermometers" of cans, the Ashleys have at least 4 crates of cans that they bring in on forklifts. However, the end result is 4,362 cans for the Ashleys. This may seem kind of picky, but I think there was more cans than 4,362.
Suggested correction: This is literally just an assumption, and nothing else. 4,362 is a pretty huge number, and with the amount of cans that we see the Ashleys collect in the episode, combined with the amount of cans that they and the rest of Miss Furley's class collected off-screen, it is perfectly believable that Miss Furley's class would end up collecting that amount of cans.
Adventures in Turtle-Sitting - S6-E4
Revealing mistake: When Leonardo throws his katana at the tree which Michelangelo and April are tied around, you can see the rope is cut and begins falling off the tree before the katana touches it. (00:20:33)
Revealing mistake: When Gamora is warning Silver Surfer to think about what he is saying, the gallery of characters behind her are the exact same on both mezzanines.
Revealing mistake: When the duel begins, the Shadow Duelist goes first. He has five cards in his left hand and draws a sixth card from his deck. He then places the sixth card next to the fifth card, and then picks up the fifth card in his hand, but the sixth card remains in the same position, without its position being affected by the fifth card being picked up. (00:12:32)
Lightspeed - S5-E8
Revealing mistake: When the HIVE Five exit the museum and are intercepted by Kid Flash, Mammoth loses both his pants and the artifacts he has before KF whizzes past him. It's best seen in slow motion; at normal speed this mistake is hard to catch.
The Defection of Hawkeye - S1-E8
Revealing mistake: When Spider-Woman is blasting at Whirlwind and Blizzard, one shot pans to the left from Whirlwind to Blizzard, and you can see the edge of an animation cel. (00:05:03)
Revealing mistake: When Martin is amazed about the osprey, Chris' hand clips through Martin's sleeve in front of it.
Revealing mistake: The fireworks explosions lack any depth and perspective, and are superimposed in a way that puts them completely out of place, in particular in the panning shot of the hotel veranda after the crown prince hightails. (00:17:50)
Is Lupin Burning... ?! - S1-E1
Revealing mistake: When Lupin goes past the finish line, the background repeats itself with a visible loop (the beginning and end don't match). You can also spot a misspelled "Danlop" sign. (00:18:00)
Race to the Spaceship/Sandbox Surprise - S3-E5
Revealing mistake: In the sequence where Pig is making a pizza with strange toppings, an ant caries a large bucket of popcorn up the counter. It is flush on its back with no top when on the floor, and the popcorn is bulging out. The ant turns 90 degrees and walks up the counter, and the popcorn thus turns on its side in the air. Not one piece of popcorn falls out or even shifts, despite the pile now pointing out rather than up.
Young Kidaichi's Murder: File 1 - S2-E1
Revealing mistake: There's a frame of animation obviously missing when the cameraman moves past the rest of the crowd that gathers after the maid's scream. He basically teleports past Miyuki while his hand is still in the same position it had when he had the hand on her shoulder. (00:14:40)
Revealing mistake: When Caleb arrives, as he's talking to Billaba and Grey, his Padawan braid clips through his cloak as it sways back and forth. (00:02:05)
Mind Your Mummy Mommy, Mario - S1-E3
Revealing mistake: When Toad spots the case, he passes through Luigi's tail. (00:08:24)
Revealing mistake: After Round Alpha-1 concludes in the Inner City Academic Amathalon, Vinnie complains that he should have studied, and his head falls to the table. However, for about 1 frame before his head falls to the table and Rocket grabs his ear, the shadow of his head can be seen on the table while his head stays upright. (00:09:20)
Revealing mistake: When Grapefruit cannonballs into the pull, it splashes on Pear. But no sign of any wetness is seen at all on him or the diving board.