Factual error: When Clint Eastwood first goes to the barber shop, the barber very deliberately sharpens his razor the wrong way, flipping the blade with its sharp edge against the strop - this would instantly dull the blade. No real barber would make this mistake, but it's a common movie error.
Factual error: Jamie unloads rectangular, machine-tied, modern-day straw bales from his cart. (00:41:00)
Suggested correction: This type of hay balers have been in use since the 1850's. There's nothing "modern" about them.
Factual error: Anne Margaret is seen changing into pants, and as she's shown stepping into the pant leg she is wearing white pantyhose. Pantyhose wasn't invented at this time.