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Continuity mistake: Rex's kama (the black kilt-like thing he wears) is missing twice: first when he, Anakin and Ahsoka are looking at a hologram of an AT-TE on the Resolute's bridge, and second when Anakin's trap for Grievous is revealed, and Rex orders the AT-TEs on the asteroids to fire. (00:01:12 - 00:04:10)
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Bat Mitzvah Crashers/Super Secret Weakness - S1-E5
Continuity mistake: In "Li'l Orphan Happy" when Ben makes his mom the tuna salad, it has lettuce around it, but in the close-up the lettuce disappears. When it gets zoomed-out on, the lettuce is back.
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Triumvirate of Terror! - S3-E8
Continuity mistake: After revealing himself to Wonder Woman, Joker rips of his cross-dress disguise. The two halves land on the ground on both sides of him. But then when he subdues Wonder Woman with his Joker gas, he is standing in the same spot, approximately, and the torn clothing is now gone. (00:12:00)
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Iron Forged in Fire: Part One - S1-E1
Continuity mistake: When Obadiah walks in Howard’s office, complaining that Howard rejected his proposal to repurpose the Earth Movers for military application, he is holding a folder in his hand marked confidential. There is a white label on it, and the tab is towards the upper right corner near his head. A few shots later, the folder is completely turned around, the white label and confidential stamp facing the other direction, with the tab by his legs now. (00:02:50)
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Continuity mistake: When Angel is saying goodbye to Wolverine, the driver's side door of his car is open, and he is standing on the interior side of it. When the shot changes, you can see the door is now closed (note the window glare). (00:03:41)
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Six-Can Solution/Silence of the Sheep - S4-E21
Continuity mistake: In "The Six Can Solution" Odie steals 6 cans, then when he gets to the girl's house there are 12 cans in his red wagon when the camera zeros in on Squeak. (00:10:10 - 00:11:30)