'So you like fish' = I see that you like fish. If the transcript reads 'Do you like fish', then it has either been written inaccurately or you have heard the CD voice incorrectly. However, your description of the CD does not make it clear what worries you about the lyrics.
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Bbk_agpFor adults we can simply say "it's a mistake", but children didn't accept it!But I don't think it is necessarily a mistake. It just seems a natural variation in the questioning.