Charlie and his partner are to deliver a piano to 666 Prospect St. and repossess one from 999 Prospect St. They confuse the addresses. The difficulties of delivering the piano by mule cart, and most of the specific gags, appeared later in Laurel and Hardy's "The Music Box".
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Did You Know?
When Charlie Chaplin and Mack Swain remove the piano from the shop where they work, and pause outside to bicker, the shop window reflects a large crowd of bystanders who have stopped to watch the comedians perform for the cameras. See more
Edited into Comedy Cocktail