Clara may I ask have you tried potty training a child before? Seeing a cartoon showing natural body function may be strange in many countries but I thought it had been done in a tactful way. I would exclude the english words from that statement though, as who knows what the actual Japanese word really means. I am just saying try to remember the translation for the word "Sh*t" could just mean something nicer in Japanese that is not considered a foul word.
I wish I had seen this clip when training my first boy he might have caught on to doing number two a bit faster he was real stubborn. I think this toilet seat and encouraging little sing-a-long might actually work!