uncredited acting parts , and some parts not even mentioned in the cast

50 years on, we still watch Get Smart and other old shows on daily tv in Australia. We often check IMDb for details to follow an actor's career. It is really annoying when an actor's part is uncredited, but it is even worse when the parts are totally ignored and no mention whatsoever is made. Watching episode 'Satan Place' , reading the IMDb reviews , (and google) refer to Dr Lazlo von Havoc and his nurse, yet these 2 parts don't get a mention in the cast.