When Daphne attempts to recruit Shaggy and Scooby to inspect the castle with her, Shaggy objects. He says: "Like, Scoob and me don't do castles. Because castles have paintings with eyes that watch you, and suits of armor you think is a statue with a guy inside that follows you every time you turn around!" Everything that Shaggy describes, occurred in Scooby Doo, Where Are You!: What a Night for a Knight (1969), the very first Scooby-Doo cartoon to be aired.