Though non-canonical as such, the story appears to take take place in a universe where a number of Carl Barks's stories (up to 1958) happened, allowing 12 years' gap between the last Barks story and the events of Return to Duckburg Place. Post-1958 stories notably appear null and void, with no trace of Magica De Spell in the apocalyptic Duckburg; reference is made to "grisly" events happening as early as 1962...