cel from cartoon Lonesome Ghosts featuring Mickey Mouse traipsing through a dark house with a shotgun shadowed by a large blue smiling ghost
Deacon, Murphressboro/Columbia, Tennessee
A: Lonesome Ghosts was a popular 1937 cartoon featuring Mickey Mouse, Donald Duck and Goofy as ghost exterminators.  It was directed by Burt Gillett, who directed many Disney cartoons in that era, and is perhaps best remembered by animators at the Disney Studio because of the transparent paint that was created for the ghosts.  Few cels from the cartoon have ever been on the market.
Sleeping Beauty
Jeremy, Singapore, Singapore
A: The Queen in Sleeping Beauty was not named, probably because she had such a minor role.  None of the other names you mentioned are official, though occasionally character names are created for sequels, television series, merchandise, publications, or other uses.
Peter Pan concept art by Mary Blair
Yanit Hen, Ramat Gan, Israel
A: Do you have the book about Mary? The Art and Flair of Mary Blair, by John Canemaker. It was published by Disney Editions in 2003, and updated in 2014. The Walt Disney Archives does not have original art for the Disney animated films; that is in the company’s Animation Research Library, and not available to students for research.
step sisters from Cinderella
Carol, Lansing, Michigan
A: Drizella is the name that has been associated with the character since the animated motion picture was made in 1950. Drizella is the stepsister with the dark hair. There have been occasional misspellings of Drusilla and Drucilla; in the 2015 live-action film, the character was Drisella.
Steve, Ithaca, New York
A: The motion picture you cite is The Reluctant Dragon (1941). Robert Benchley is the actor bringing the book to the Studio, and he does indeed meet Walt at the end of the film, only to find that Disney has already made a film of the story. The cartoon segment about the dragon was also released separately as a short, with the same title.
Brent, Dallas, Texas
A: I do not know for sure, but since the prints of Three Little Pigs and Fantasia submitted to the National Film Registry at the Library of Congress were sent in 2007 and 1990 respectively, I would guess that they are the revised prints, since the revisions had been made decades earlier. The original versions, however, are maintained in the Disney film vaults, but are not available for viewing.