The local newspaper review of Blue Lagoon commented the the,now, mature kids would have not had access to good dental care, but they both had pearly white smiles :D ...
If you check teh "goofs" section on IMDB for just about any historical film there will be anachronisms listed ...
And that...
I believe they only have the rights for certain territories...as with RKO material ... I'm sure in the mind of WB the monies they spend might be better spent on assets they control all the rights. They have done some excellent work with these other properties as well (eg Ambersons and Citizen...