Wander breaks the fourth wall when he says, "Normally I'd spend at least eleven minutes on this sort of thing," which refers to the runtime of a standard episode.
During the sequence of title cards in "The Matchmaker", both Wander and Sylvia are transformed into their voice actors when "The ???" appears.
The shot of Hater posing in front of the H.A.T.E.R.V. as the camera rotates around him parodies the opening of Speed Racer (1967).