At the beginning of the episode, Critic calls "The Swan Princess" a Warner Bros. animated film. It was actually an independently-financed project that Warner had absolutely no involvement in. Doug and Rob Walker must have assumed that idea because Warner Bros. initially released the film on DVD; those rights have since expired.
The Critic says that the idea of Rothbart's assistant disguising herself as the princess is ripped off from [[The Little Mermaid (1989)]]. However, this was a plot element in the ballet on which the movie was based as Rothbart's daughter disguised herself as Odette.