That's Using Your Head is the third part of episode 31 in season 2 of Dexter's Laboratory, which first aired on March 18, 1998. In this episode, Dexter meets a crazy homeless man who thinks he can communicate with aliens, as the man is wearing a lot of electronic devices. In the hopes of communicating with the aliens, Dexter takes the man to his lab for further research.
Dexter is shopping at Electronics To Go, a parody of the store Rooms To Go.
In Dee Dee's pile of stuffed animals one is visible for a few frames resembling Winnie The Pooh,another is seen on Dexter's guest that resembles Snoopy, a character from Peanuts.