The Grim Adventures Of Billy And Mandy (2001)
0 continuity mistakes in season 1 - chronological order
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Duck/Aren't You Chupacabra to See Me? - S4-E9
Continuity mistake: Mandy is in the library working on her report. When she's working on the second page, the writing is scribble, and on top of a stack of paper. A second later, the page says "CORN by Mandy", and the stack of paper is gone.
Billy's Mom: Oh sorry, Billy. We weren't laughing AT you, we were laughing with you.
Billy's Dad: I was laughing AT you.