When I first saw this film back in seventies I suspected right from the opening credits that this film was shot originally in 3D. The credits open with a shot of a piece of glass shattering and the fragments flying into the camera. The most obvious scene is when John Forsythe wanders around in a daze after discovering the body of the slain actress/former mistress. He goes through various narrow escapes where just about everything is thrown at him/the camera. A truck driver throws out a stack of newspapers, a fire escape ladder comes down and narrowly misses him, he almost gets run over by a taxi, a truck unloads a load of crushed rock and more. I would not have been surprised if someone threw a kitchen sink from one of the buildings Forsythe walks by. SPOILER! On the mystery side, the gimmick is having the killer (Edward G.), a T.V. writer working on a "Crime Of The Week" T.V. show. He writes a script based on the murder and gives himself away when he includes details only the killer would know.
Review of The Glass Web
