Your Sgt. R. Hillman of 418 Squadron should be Sgt. A.J.R. Millman:
http://www.cwgc.org/search/casualty_...sualty=2095741
He and his crew are buried in a small seaside town in France - one assumes they fell foul of coastal flak.
Perhaps you may be able to identify other typos by searching on dates in the CWGC via this truly staggering site:
http://www.hut-six.co.uk/cgi-bin/search39-47.php
As for 418 Squadron - they were flying Havocs and pretty much having to learn it for themselve. 23 Squadron were on Mosquitos by that point. Dave McIntosh and Doug Alcorn provide a certain amount of insight in their respective books.
As McIntosh says, 11 3-man crews were lost before a 418 Squadron crew scored a million-to-one shot by bombing an e/a as it was landing.
The American flyers on 157 Squadron were lost when their aircraft ditched in the Bay of Biscay due to engine failure.