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.