Revealing mistake: When Akane is sneaking out to the kitchen in order to cook something she briefly has a see-through hand, the animators haven't added any pigment and you can see the background cell perfectly.
Ranma ½: Big Trouble in Nekonron, China (1991)
1 mistake - chronological order
Directed by: Shuji Iuchi
Starring: Megumi Hayashibara, Kappei Yamaguchi, Noriko Hidaka, Kaneto Shiozawa
Trivia: Every single character in the Ranma 1/2 original Japanese manga that has appeared up until the time the movie was made, including several regularly appearing characters who appear nowhere else in the movie, appear in the opening sequence.