Because of the way Sir Rex Harrison talked his way through the musical numbers, they were unable to pre-record them and have him lip-sync, so a wireless microphone (one of the first ever developed) was rigged up and hidden under his tie. However, this meant that his mouth and words were completely in sync and everyone else's looked off, since they were lip-synching (when everyone is lip-synching, it's not that noticeable). The studio thought that this was too obvious so they altered Harrison's soundtrack, lengthening and shortening notes in various places so that his synchronicity is slightly off like all of the other actors and actresses.

Film

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