Doug's Shock Therapy / Doug Is Hamburger Boy - S3-E11
Plot hole: Doug recalls previous years (in a flashback, where he was next to Skeeter at the window of the Honker Burger as they looked outside) of seeing the Hamburger Boy when Mr. Dink is confessing that he *was* Hamburger Boy. However, Doug has only been living in Bluffington for one year - this was his first summer there.
Tintin and the Picaros: Part 2 - S2-E9
Plot hole: When the helicopter flies over the jungle, Haddock inadvertently walks in view of the helicopter and the pilot of the helicopter notices him, assuming it to be a Picaro. Haddock then trips into the river, but despite being watched by the pilot of the helicopter the entire time, the helicopter pilot doesn't notice him falling into the river and instead assumes he just disappeared. (00:26:20)