About 33 mins when Iris gets in the car she has a brown paper bag as well as her books.
When she gets out at the school she doesn't have the bag.
Iris and Maggie are seen leaving a cinema where they have just watched a showing of The Magnificent Seven, which was released in the US in October 1960.
Posters for forthcoming attractions include The Curse Of The Werewolf and The Sergeant Was A Lady. The former was released in the US in June 1961 and the latter in October 1961.
It is inconceivable that a cinema would be promoting a film that would not be released for another eight months, let alone one that would not be seen for a whole year.