It could be a tool the playwright uses, but I have never heard it referred to as such. Certainly many playwrights, such as David Belasco, relied heavity on spectacle to make their plays successful. Today, We are mostly interested in the story (Plot) and the Characters. Spectacle is one of Aristotle's six parts of a tragedy. It refers to all of the physical parts of the play, props, scenery, costumes, lighting, and could also include sound effects, choreography and so on. (Aristotle's other five parts of a tragedy are Plot, Character, Thought, Diction,and Music. (unfortunately,he never explained what he meant by music)
The Poetics of Aristotle.