Sense of Sensibility (1995)
This 1995 Jane Austen adaptation tells the story of the Dashwood sisters, Elinor and Marianne, as they come of age. However, the baby in the film is wearing far too modern a diaper for the late 1700s. At the time, babies would have only worn cloth diapers.
My Girl (1991)
My Girl is a heartbreaking coming-of-age story following an 11-year-old whose mother died giving birth to her. Anna Chlumsky, who plays the main character Vada Sultenfuss, can be seen wearing a mood ring. The movie was set in 1972, but mood rings only became popular in 1975.