Possibly as an homage to the segment "Christmas: Impossible" from Mickey's Twice Upon a Christmas (2004), Scrooge says that Santa Claus is not allowed near his home.
Huey mentions the presence of a Mountain Goat on the map he saw at the resort, and later names a big cliff "Bunny Rock", paying tribute to the enemies seen in the Himalayas level of the DuckTales (1989) video game and it's remake DuckTales: Remastered (2013).
George Mallory was a real life mountaineer who, like Mallardy, died while attempting to reach the summit of Mount Everest.
The Past Famous Climber of Mt. Neverrest George Mallardy bares a slight resemblance to Scrooge's Rival Sir Guy Stand-off in the episode "The Lost Crown of Genghis Khan" in the Original DuckTales (1987), only being a Duck instead of a Dog.