Doug's name is used in the title of each episode.
Truth or dare, Larry?
Larry the A.V. Nerd: Truth.
Willie White: OK. Have you ever watched a filmstrip at school without permission?
Larry the A.V. Nerd: Well, there was this one time...
Roger Klotz: Hold it! You can do better than that, Willie.
Willie White: OK. Who do you have a crush on?
Larry the A.V. Nerd: Uh, well, I guess I like... Beebe.
Beebe Bluff: AAAH!
Roger Klotz: Hey, ...
When Doug and Skeeter go on the Beets Bus to attend their concert, the tour guide states that 10 minutes is "one fifth of an hour." It's actually one sixth of an hour.
During the end credits, Doug waves to viewers and gets tired, while Porkchop listens to a walkman.