>>280414163
Furinkan notes that: "One of the cursed items in the Treasure House where Sabato steals the beckoning cat from is the faux mermaid. This is referenced in Takahashi's Mermaid Series chapter 12. There are also a number of cursed dolls that resemble the curse doll from Ranma 1/2 chapter 331."

I don't think Rumiko was deliberately referencing her old works here though, they're just commonly referenced supposedly cursed things.