There was an american in the crew, while the dam raid affected a small area of germany it was the equivalent of putting sheffield (think of all the steel works) out of action. They were making machinery and also synthetic oil and fuel, cut production did have some knock on effects.
yes, it got banded about for morale as did most other things that went well at the time.
The bouncing bombs that weren't used had no use as there were no other dams worth hitting, 617sq continued to do low level bombing, diving to 40ft in lancasters to drop markers before slamming the area with tallboys and grand-slam bombs which were as dangerous (some missions they were entire tonnes over weight taking off) as the original mission
To be honest, I'd imagine the relatives of all concerned are just embarresed the dog was called that in the first place.
they didnt need the bombs later though, tallboy was working

. even the smaller anti ship ones, which were intended for turpitz werent used because they'd hit the ship with tallboys..
Twice, despite having actually hit her the first time, shame the water wasn't deeper or they'd not have had to go back.
Apparently Peter Jackson intends to use relative unknowns as many of the crews were young men in their very early 20s. While they were predominantly British there were also New Zealanders, Australians (I think) and Americans in the crews.
sounds about right for the nationalities