65th Academy Awards
There was a minor controversy when Snow White (Disney character) was presenting an award for Best Animated Short Subject. She was voiced by Mary Kay Bergman, Adriana Caselotti, the original voice of Snow White was not aware of this. She was reportedly offended that Disney didn't ask her to voice Snow White during the ceremony.
Moroni Olsen
His most famous role was the voice of the Slave in The Magic Mirror in Walt Disney's "Snow White and the Seven Dwarfs" (1937). Olsen also provided the voice of the senior angel in "It's a Wonderful Life".