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.
The Blue Lotus: Part 1 - S1-E8
Plot hole: When the Chinese man who visits Tintin goes crazy from the same type of dart that was shot at Doctor Sarcophagus, he tells the guard to go to the Maharajah's son. About 9 seconds later, they are seen bringing the boy back inside. There wouldn't have been enough time for them to get all the way to the ground considering they were a floor above them a few seconds ago. (00:03:05)
Video Mania - S3-E6
Plot hole: The plot for this episode is that Mark reluctantly tries out video games for the first time and soon becomes addicted to them. However, the season 1 episode "All in the Family" showed him to already be an avid gamer.
Plot hole: Tim has the mike in his hand and steps repeatedly forwards to talk to Jill, the cord being long enough to allow him to do so. However once Jill leaves and he wants to go after her the mike knocks over the jar of mosquitoes. Up until then, there was no indication that the mike had been changed or moved but he never at the risk of knocking over the jar until then.