Corrected entry: Possible spoiler! At one point, Father Flynn tells Darlene Sweet that he likely has Alzheimer's Disease. The film is set in 1968, and the term "Alzheimer's" as a specific diagnosis was not commonly used until after a 1977 medical conference.
Corrected entry: Miles was just hurt by the glass in his face, but his body was hit by a bullet, just like the FBI agent.
Correction: The term "Alzheimer's" did exist prior to 1977 and was a valid diagnosis. The medical conference mentioned only set to change the use of the term as they began to understand the pathology of the disease and now understood elderly patients could develop Alzheimer's as well, which differs than senile dementia. Prior to 1977, the disease was only diagnosed in patients under 65.