Factual error: In the scene where the boys are driving to (or from) the dance, while driving down the street, you can clearly see a 1988-1991 Honda Civic hatchback in a driveway. Obviously this car was overlooked since this movie was set in the 1970's.
Factual error: A medical examiner or coroner (or other physician) typically determines cause of death, so unless Father Moody had a medical degree, his statement to Mr. And Mrs. Lisbon - he "listed Cecilia's death as an accident" - would not be official. It also isn't revealed exactly where Father Moody made such a listing.
Suggested correction: It wouldn't be necessary for the death certificate to list "accidental death", only for the priest to do so for church records so she could be buried in a holy cemetery.
