Where is there an example of stream of consciousness scenes in Faulkner's The Sound and the Fury?

Your best examples of the stream of consciousness technique will come from the first two sections:  Benjy's and Quentin's. Benjy is mentally challenged, and as such he has no true concept of time.  Present developments trigger past memories.  Accounts of Caddy's climbing the tree, her wedding, Benjy's name change, Quentin and Caddy fighting as children are interspersed with the present developments of golfers golfing and Luster hunting for his money in the grass.  The passages in italics would be good places to begin to search for examples. 

Quentin's section is no less difficult for the reader.  Quentin is a Harvard student, clearly intelligent, and unlike Benjy, very aware of time.  But his mind also races from past to present and back again, as this section records Quentin's thoughts a day before his suicide.  If you turn to this section, you will have no trouble finding examples of references to time, past, present, and his obsession with Caddy.  Quentin is clearly unbalanced, and Faulkner's style represents this mental instability.  Places to look in this section for examples are the lengthy paragraphs and italics that often contain Quentin's recollections of conversations he has had with his father--mainly Quentin's attempts to prevent Caddy's marriage-- and with his mother.   At the heart of this section, though, are Quentins' conversations with Caddy that are recounted in short phrases without quotation marks or punctuation of any kind, for that matter, echoing Quentin's recollection of their discussion of Caddy's sexual activities.