When Orin is telling his parents about his plans to pursue his business dreams, there is nothing on the table section next to where the dad is sitting. But on the following cut which is a closeup of his dad, there now appears a condiment rack next to the dad's left arm. When it goes back to a long shot of the table, the condiment rack that was next to the dad has now disappeared.
Once the story reaches the year 1929, all the women wear 1933 fashions, an unfortunate anachronism, since styles had changed dramatically in those four years, and everything we see them wearing in what is supposed to be 1929 is completely out of tune with the actual styles of that period.
At around an hour into the film, when Paul enters the office holding a newspaper, in the second shot of him, a moving shadow of the boom microphone is visible to the right of the doorway.