Continuity Error

There's a continuity error in this episode where Doris and Montgomery are walking down the street on their way to the Hank Burger Audition. Doris wearing Blue, a skirt and red tights. Montgomery is wearing green trousers and a light brown jacket. The scene is a little strange as its all in long shot and it looks as though the dialogue as been added afterwards. Anyway from what is said it looks like they have just arrived. The very next scene has them inside the audition and wearing completely different clothes. Doris is now in red and is wearing trousers and Montgomery is wearing blue trousers with a darker brown jacket. Doris' outfit is the same she was wearing Sherwood's class before we see them on the streets.