Go to the outtakes at the end. Mrs Potato Head is packing Mr. Potato Head's stuff into his derriére, and although she says "teeth" (i. e. wind-up fake teeth), the closed captioning reads 'cheese'.
Actually, the CC dialogue can be very different from the actual dialogue that they're speaking. Take the first few seasons of South Park, for example. When Kenny says his line in the intro, the CC says, "One potato, two potato, one potato, two potato". In reality, he says, "I like girls with big fat ****ies, I like girls with big ******s!"