In the dance scene when the tango music comes on, K.C. says she learned to tango by "watching one of those celebrity dance shows." Zendaya actually took second place on Dancing with the Stars (2011) in 2013.
In the episode's premiere, as well as in DVD releases, there's a scene of K.C. and her parents on a mission at a restaurant. The scene takes place six months after K.C. is appointed as a spy and the show intro doesn't play. In reruns, however, the intro is featured (even though Trinitee's JUDY is not introduced until the next episode), without there being a pre-title scene, and the scene of K.C.'s mission at the restaurant is cut entirely.
She says her name has a E in it which means her name is spelled kaycee not K.C.