In this episode Morgana says sun makes her skin feel all bad. But she was exsposed to the sun in " Just Us Justic Ducks" and she was fine. (even if this episode aired before that, it would still be a goof.
Darkwing: Why would bats want anchovies?
Launchpad: Maybe they're worried about their cholesterol count!
Launchpad: Gee DW, sorry about your girlfriend being a fiendish, bloodsucking creature from the netherworld.
Darkwing: Hey, hey, hey! - Nobody's doing any bloodsucking! She's just misguided.
Darkwing: Did I miss something? Where was the off ramp that said 'the twilight zone'?
Darkwing: I am the onion that stings in your eyes!
Morgana: Good evening. I'm Morgana Macawber, president of Macawber's Mushrooms. Nice to meet you, mister--
Darkwing: Dingwing Dork--(Flustered; indistinguishable stammering) Dark...Dark...Darkwing Duck. (Recovers) At your service.
Morgana: What an unusual name. But then you appear to be very unusual. I like that.
When Darkwing and Launchpad are chasing the Hell Hounds near the beginning of the episode, there is a billboard advert for 'Duck Soup' in the backround. As many of the citizens of St Canard are ducks, this would make them cannnibals.
This is Morgana's first appearance.
Darkwing opens a door to be confronted with a room full of staircases that are upside down, back to front, and lead all over the place. This is a take on a very famous 1953 lithograh by M.C Escher called Relativity. Maurits Corneli Escher was a Dutch graphic artist famous for his works that created optical illusions and his 'so called impossible structures', including 'Ascending and Descending', and 'Other World'. His works are known all over the world, with 'Relativity' being perhaps the most famous. He made over 448 woodcuts and lithographs, and 2000 sketches in his lifetime, and died in 1972 at the age of 74.
Bram Stoker's Dracula
Darkwing: Hold it right there, Renfield.
Renfield is the insane assistant to Count Dracula in Bram Stoker's novel, also featured in many subsequent films.