Audio problem: When one of the soldiers serenades outside the O'Rourkes' place he is accompanied by an accordion and a guitar. However, what you hear is an accordion and a banjo. (00:39:10)
Audio problem: When Phillip plays on the piano, the music doesn't match his finger movements.
Audio problem: In a scene when the Blandings first move into their dream house, Cary Grant (Jim Blandings) says something to a workman and his lips clearly don't match what is heard.
Audio problem: While Judy Garland is singing in the bar and Fred Astaire spots her, the trombone backing up Judy Garland is playing, and suddenly the trombone sound goes from open to the sound of a muted trombone. However, the actor continues playing it unmuted. He should have a cup mute in his horn at this point. (00:18:19 - 00:19:38)