These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Scrooge McDuck Universe
Adaptation Displacement: Panchito's horse, Seņor Martinez actually comes from old American newspaper strips written in the 40s which, while popular in some countries, were never reprinted in English until after the publication of The Three Caballeros Ride Again
Anvilicious: Some of the stories (especially War of the Wendigo) move into this territory.
Epileptic Trees: How Ludwig von Drake is related to Donald is quite a mystery. He is apparently Donald's uncle, but this would make him either Scrooge's brother or Grandma's son, neither of which seems likely since he is Austrian. Don Rosa has offered the possible explanation that he is married to Scrooge's sister, Matilda.
Some German comics have Daisy calling him "Uncle".
"Funny Aneurysm" Moment: Keep 9/11 in mind when you see this◊. I mean, come on! He called it the "Twin Office Towers," for Pete's sake!
Rockerduck seems to appear more frequently in Italian comics than Glomgold ever did in American ones.
The Beagle Boys' grandfather appears much more frequently in Italian stories, but that version of the character appears to be solely based on the "Grandpa Beagle" from "The Money Well" and not on Blackheart Beagle from "The Fantastic River Race." Some of the versions make him more kind.