Bygone Errors is the second part of the 9th episode in season 4 of Dexter's Laboratory, which first aired on September 12, 2003. In this episode, Dexter and Dee Dee reminiscence about their past.
Old Man Dexter tells stories about what his life was like back when he was a kid but Dee Dee as an old lady is there to correct him.
- This episode marks Old Man Dexter's and Number 12's last appearances in the show.
- One of Dexter's stories was a story of him being in an alien restaurant being chased by aliens. This may be a parody on Samurai Jack.
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