Audio problem: When they are trying to escape Koopa and the little caveman speaks, then Luigi answers him, he has the Princess' voice.
Kotsuban uranai! Ranma wa nihonichi no oyomesan - S1-E14
Continuity mistake: The altar brought in by Tofu's mother is a big one (Ranma comments as such), but it's much smaller when everyone prays to it a few moments later. (00:03:35)