Captain Marvel in Captain Marvel
When Brie Larson was shown in a green costume, fans were rightfully upset. Captain Marvel was supposed to be sporting red white and blue, and this costume was not it. The filmmakers said the green costume that was seen in behind-the-scenes photos was authentic to the comics, as she wore it in the beginning.
Mickey Rooney in Breakast at Tiffany's
One of the most offensive costumes and castings was in Breakfast at Tiffany’s. Mickey Rooney was cast as an Asian character named Mr. Yunioshi. Obviously, Rooney is not Asian. The costume and character was both very stereotypical and offensive. Naturally, back in the day, this wasn't a "big deal," but fortunately racism in Hollywood is no longer able to hide behind the guise of a gag joke.