Factual error: In the scene where they are in the U.K, a little boy is hit by a van and you can hear the police and medical services coming. The sirens are American sirens which differ greatly from the High Low pitch that the U.k Is famous for and do not fit the scene at all.
Factual error: At the very beginning, "Hereafter" makes the same factual mistake as was made in "2012" and "San Andreas": Crystal-clear tsunami flood waters. Of course, tsunami floods are always inky-black, filled with churned-up silt, sediment and debris.
Trivia: Given that Clint Eastwood has composed much of the music for his films over the last 25 years, it's not surprising that the soundtracks of "Hereafter" and "Unforgiven" are incredibly similar, if not interchangeable.