In this episode Jessie mentions that she has a Lickitung. However, she doesn't actually capture Lickitung until three episodes later. This is because that episode chronologically occurs directly before this one, but was postponed in the rescheduling after the incident with the Prygon episode.
The fourth wall is broken twice in this episode. The first is when Meowth says, "[H]e tricked us two times in one episode!" Later, the narrator says that Misty got her backpack back with "a little help from Psyduck", which Psyduck responds to questioningly. The narrator then adds "Or rather, a lot of help from Psyduck", which makes it smile.
Two real-world animals are mentioned when Meowth states that it's "like letting your cat watch your canary"
In the dub, Brock refers to Psyduck as a male when Misty begins yelling at Psyduck. Brock says, "Psyduck's doing the best that he can."