 In the ending scene of episode 21 "A Death in the Family", Danny  Wilde (Tony Curtis), Brett Sinclair (Roger Moore) and the Duke of  Caith (Roland Culver)are preparing to go out each with a lady  companion. The lady supposed to accompany The Duke of Caith is  introduced by Brett Sinclair as "Mrs. Schwartz" and actually played  by a disguised Tony Curtis. Tony Curtis real name is Bernard  Schwartz.