When Maurey and Sam first try sex, Maurey, in the long shots, is wearing panties with dots on them. In the close-up when she takes them off, they are plain white.
Maury says that if Sam has to go to military school, in 4 years he will be 18 and can do whatever he wants. But the age of legal majority was 21 in 1963, and wasn't lowered to 18 until 1971.
Maurey goes to the clinic in school clothes but comes home in a hospital gown.