In the scene where Lou (the beagle) is watching Looney Tunes late at night, you see he's watching the Chuck Jones short "Chow Hound" from 1951. The electronics dog (Sam, I think his name is) is also watching the cartoon in his base. But watch the reflection of the cartoon behind him. Even though the dialogue changes (from the dog, to the cat, then to a lady) the scene's reflection stays the same.