Some of the cars in the film aren't period-correct, notably the 1957 Ford Country Sedan station wagon Maryellen and her family use.
In Maryellen's bedroom there is a pair of blue Plastic handled scissors that look like a popular brand sold today.
In the family's kitchen there is a square plastic bottle of vegetable oil on the counter as opposed to glass. Also there is a loaf of Wonder bread with a see through wrapper - as opposed to the solid white wrapper that was used during this time.
The nurse at the hospital in the ending had a modern BLUE stethoscope.
In the laundry room there is a plastic laundry drain sink as opposed to a cement drain sink popular in the 50's.