When Roy is taking his first 'tour' of the Rehab center he sees several children playing. One girl is playing with a toy telephone that has a push-button dial. Push-button phones were not introduced until the early 1960s.
Several patients at the rehab center have clothes and hairstyles from the early 1970s.
When Roy leaves the hospital for the first time in three months and Sam is driving him home they're riding in a 1959 Cadillac but the month and year were April of 1958.