One of the distinctive characteristics of noir is the dark, shadowy atmosphere and Perry Mason made effective use of it.  Left: Frainkie Laine mulls over his next move in The Case of The Jaded Joker.  Center: Your sense tells you that nothing good can come from this motel scene in The Case of the Romantic Rogue.   Right:  Ominous  crime scene  in The Case of the Prodigal Parent.   

The femme fatale was someone to avoid in noir.  They were just as deadly in Perry Mason.  Left: Virginia Greeg in The Case of the Cautious Coquette.  Center:  Helen Stanley and Ruta Lee in The Case of the Footloose Doll.  Right:  Andrea King in The Case of the Bedeviled Doctor.