Factual error: When Pauline makes her first entry into her 1953 diary, the date at the top of the page is January 1, Thursday. Later in the film when she begins her diary for 1954, the date on the page is January 1, Thursday. The same date in two consecutive years cannot be the same day of the week, they are a day apart (2 in a leap year). In actual fact, 1 January 1954 was a Friday. (00:24:20 - 01:03:45)
Factual error: In the scene, set in 1952, where Pauline and Juliet sit on a bench during P.E., they're reading 'Biggles of 266' (by Captain Johns). The book however, was published in 1956.