In the kitchen we see Alma decorating a cake with "Welcome Home Doctor". But later, when she goes to put the cake in the cupboard, the decoration is missing.
When Adolf takes out a loan, the document says the barber shop is on High Street, but when Laura reads the ad regarding the manicurist job, the shop is said to be on Elm Street. Later, a notice from the loan company says Elm Street, too, even though it's the same shop as the original loan document.
Lawrence and Muriel get married spur-of-the-moment on the same day Adolf gets a loan to help Lawrence set up a doctor's office. The date shown on the loan document turns out to be a Saturday. While it's possible Adolf's friend at the Building & Loan Association would do business with him on a Saturday, government offices would not be open to obtain a marriage certificate, much less conduct a ceremony.
When Adolf takes out a $2,000 loan on his barbershop fixtures, his last name is misspelled on the contract as "Wagenkempf".
When Johnnie arrives home for Christmas, he takes off his scarf and puts it in his coat pocket. In a subsequent scene seconds later the scarf is back around his neck and he takes it off again.