Fascinating and tragic case and not easy to dismiss aa a child's fantasy. A good summary here:
https://psi-encyclopedia.spr.ac.uk/articles/carl-edon-reincarnation-case#Later_Development
One thing I did notice is that from that video he has his mother's nose, in fact she looks quite German herself, so did she have Germanic roots as so many of us British do...? Also I know families with male children who have starkly differing hair and eye colours. One family I know the eldest boy has dad's light green eyes and fair hair whereas the middle boy has mum's almost jet black hair and his eyes are so dark green they often appear black. Also, mum and dad state they had no interest in WW2, however has any asked if there was an uncle or grandfather in the picture?
WW2 was certainly talked about in the playground of our 1970s primary school (Carl was born in 1972) and my brother used to get the war comic 'Victor':
View attachment 56735
So did he have access to this or a similar magazine, perhaps a friend's house?
That his parents went public about his recollections when he was essentially just starting school is interesting in itself. We know from our own childhoods how young children seize on anything that makes a fellow pupil different or odd, so surely they would have known there was a good chance he would get bullied?
Not that doesn't begin to answer all the coincidences and parallels. Has anyone been able to determine if there was a building at the site of the bomber crash in 1942...?