User blog comment:MakeShift/The Crisis and its impact on the Arrowverse Wiki/@comment-28109177-20200123203401/@comment-2054358-20200128054756

The canonicity of Superman Returns to the Christopher Reeve Superman movies has been going back and forth. Superman Returns was meant to be a sequel to Superman II, which throws Superman III and IV out of canon, and then DC considered it it's own universe separate from the Donnerverse movies, and then Crisis has the Brandon Routh Superman reference an event from Superman III. So I don't think we should merge the Superman movies. And besides, the changed actors in the cast of Superman Returns is a big continuity error if you consider it a part of the series.