How are ancient Greece and Elizabethan theater times different?

During the early part of the 16th century, there were two distinct types of theatre in England. One was represented by small groups of professional actors who performed in halls, inns, or marketplaces. The location of a play was established by the words and gestures of the actors. As in the commedia dell’arte, these localities had little significance. The second type of theatre, found in the London area, was made up of amateurs, usually university students, performing for the royal court and assorted gentry. The audience and the actors were educated, acquainted with the classics, and knowledgeable about theatre in other countries, particularly France. The stage was probably set with buildings made of laths, covered with painted canvas, with cloud borders masking the upper part of the acting area.

Where are the statements, only the paragraph is here