Green Goblin in Spider-Man
Honestly, the Green Goblin's suit of armor was kind of cool. Of course, there was some pushback since it wasn't part of the comics, but still. The directors went through a lot of trial and error with figuring out the look of the costume. In the end, they felt that the suit of armor was the way to go.
Cinderella in Cinderella
The biggest pushback from his film was Lily James' tiny waist. Many viewers believed that this was from CGI effects after shooting and felt that it was unfair to try and make her so skinny. Then, the filmmakers pushed back and said that there was no CGI, they just made her go on a liquid diet to get that skinny. Uh, that's not great, either.