Costello spoke with a lisp and found it difficult to make the transition to talking pictures, but after two years of voice coaching she was comfortable speaking before a microphone. One of her early sound film appearances was with her sister Helene in the Warner Bros. all-star extravaganza The Show of Shows (1929).

Her acting career became less of a priority for her following the birth of her first child, Dolores Ethel Mae "DeeDee" Barrymore, on April