Their where plans for a sequel but the idea was later scrapped due to the movie performing very poorly at box office. But in 2001, they made a CGI sequel called "Rudolph the Red-Nosed Reindeer and the Island of Misfit Toys" although it was CGI due to copyright errors.
Slyly and Ridley were redesigned only months before the movies release. Ridley was going to have a striped blue and white Butler suit and Slyly was originally going to be red before (the latter was changed to white likely to reflect the movie's North Pole setting).
Whilst the film was recorded in Canada by most of the cast, there were a few exceptions that were recorded in the United States. Examples include John Goodman as Santa and Whoopi Goldberg as Stormella.