 Several voice actors make cameos as the voice of the character(s)  they have played before. These are Tony Anselmo (qv) (Donald  Duck), Wayne Allwine (qv) (Mickey Mouse) and Mel Blanc (qv)  (Bugs Bunny, Daffy Duck, Porky Pig, Sylvester and Tweety Bird). But  most noticeable is Mae Questel (qv) as Betty Boop. Mae did Bettys  voice from 1930 until the character was retired in 1939.