I noticed this oddity the first time I beat DKC2! My theory is that all Click-Clacks were supposed to use the ending palette in-game, but they were made brighter to stand out against darker surroundings and whoever was responsible for coding the cast roll either didn't get the memo, forgot to change it, or decided to keep the old palette there.
More cast roll sequence trivia:
- Flitter uses Zinger's buzzing sound instead of its own, lower-pitched version.
- The rope Klinger is seen on is a sprite, but it isn't unique to this credits sequence. Upon closer observation, it's the vertical part of the rope used to tie up Donkey Kong, but rendered using Diddy's palette rather than the silver one it normally has.
- King Zing is missing his stinger.
- Kaptain K. Rool and Donkey Kong are the only two characters in the sequence to use three sprites.