Without diving into the weeds on this specific video it's quite common for film footage to show copyright | filmed on | final edit | etc dates that relate to production that don't match IMDB, library of record, etc dates that refer to the date of first public airing, the publishing date if you wish.
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Why does that title here and on YouTube say 1956 when the video itself says 1955?
Without diving into the weeds on this specific video it's quite common for film footage to show copyright | filmed on | final edit | etc dates that relate to production that don't match IMDB, library of record, etc dates that refer to the date of first public airing, the publishing date if you wish.
A difference of year (as here) is quite common.