Hildegarde Withers

Inspector Oscar Piper

Addison

Jane Davis

Detective Smiley North

Detective Donahue

Mr. MacFarland

Leland Stanford Jones

Otto Schweitzer, the Janitor (as Fredrik Vogeding)

Louise Halloran

Dr. Max Von Immen

Detective McTeague

Dr. Levine

Bearded diner (Uncredited)

School boy (uncredited)

Diner Counterman (uncredited)

Policeman (uncredited)