The letter that Teddy pulls from his sister's desk drawer bears the address "Bristol, CT 31637." That Zip Code is actually for Lenox, Georgia; Bristol, Connecticut's correct Zip Code is 06010.
Teddy is killed in a large house fire, which would have burned his remains down to just unrecoverable ashes, yet at the film's end, his parents are seen at his grave, implying that a body was buried there.
At the end of the movie, the brother Joey's tombstone shows his birth date as August 28, 1976 and death date as September 27, 1880.