When Joey sits down at Mrs. Simpson's table, her hands jump about between shots.
When Joey inveigles his way into employment at Ned Galvin's Nightclub by his rendition of "I Didn't Know What Time It Was", out front in the audience is a dating couple whose evening together is somewhat frosty. During the song the ice melts and eventually they are seen cuddling. Unfortunately, Joey's magic spell is short-lived, as, at the song's conclusion, the same couple are again seen in long-shot, but alas they are once again sitting on either side of the large round table.
When the butler approaches Mrs. Simpson's table to announce that Joey wants to see her, she has her hands on the table. The subsequent shot shows her lowering the juice glass, just after to drink a little.
In the beginning of the film, Joey is led by two policemen who hold him by his arms. When they approach the train, Joey's raincoat lapels are untidy. Next shot they are neat.
When Ned introduces Joey to Linda, Joey has his hands on the table. In the subsequent shot he is holding a cup, about to drink.
When Snuffy dips his bagel in the coffee there's a piece of hot dog in the center, which he proceeds to eat, then he takes the bagel out.
When Vera Simpson is singing "Bewitched" there is a very obvious mismatch between her lips and the words as she is turning away from the window.
At about 20 min when Mrs. Simpson says "You louse" to Joey her lips don't move and it sounds dubbed.
In the opening scene, Joey is escorted onto a train leaving town. Spengler's Fish Grotto is visible in the background, placing this in W Berkeley (though the police car reads "Gold City.") The train is headed north. Next, we see Joey exiting the train heading towards the "Ferry to SF" which would've been one of the Oakland stations, which is just a few minutes South of Berkeley.
Near the beginning when Joey is standing near a staircase on the ferry, he assists a young woman down the steps. As Joey is about to "make his move", her escort follows off the steps, and they walk off together. No gentleman of that era would have allowed his lady to precede him down the steps. "Ladies first" does not apply when changes in elevation are involved. In those cases, the male should always be lower (i.e., going up he should be trailing; descending, he should be in the lead). This is in case the woman stumbles, the man will be in position to catch her or break her fall.