While Andy is playing the "bones", she becomes nervous because she's not sure if a note is A-sharp or B-flat. She must be very inexperienced with the piano because A-sharp and B-flat are the same note.
Your comment about the B Flat/A Sharp was totally correct but you yourself failed to notice that it was not actually a Piano at all,it was in fact a Bone Pipe Organ! hence the dust coming out of the display of bone pipes above the keyboard. Always remember Organ's have pipes and Piano's have strings
With regards to the bone pipe organ, I believe that also when she turns the map over showing the music, she plays chords when the music actually only reads a single melody line. That always bugged me!
Actually, some really old organs would have separate keys for each enharmonic--a sharp and b flat. Enharmonic are the same note, but written differently. Technically, a sharp is tuned slightly differently than b flat. Nowadays, they do not recognize the difference as much.
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