Did Hitchcock 'borrow' his murder scene on the island in the

I'd like to know the answer to your question also. I noticed a few other similarities to "Strangers": there are several train references, a merry-go-round, and a record store including a listening booth. More generally, there's also some Hitchcockian humor.

I certainly looks like that..
So much so that at one point, for a brief moment, during a scene on the bus wen a large gentleman sat down in a nearby seat I found myself thinking...

few visible scars