The 1953 flashback scene was filmed at Newnan High School in Georgia.
Ted is supposed to be so meticulous as to not make any errors when writing his letters but only variants in spelling that, while not errors, are seldom used. When writing the letter to his brother he uses the phrase 'how do you know if it's too late to change' but he writes "how do you know if it's to late to change". This is likely an error on the actor's part.