How does the author use foreshadowing in Speed-the-Plow?

Several times in Speed-the-Plow, Mamet plays with lines that foreshadow future events in the play. However, the predicted events do not always work out exactly as intended. For example, Gould says that he "don't fuck people" in Scene 1, yet that is exactly what he does. Though it seems he will betray Fox and not get the Doug Brown picture made as he promised, Gould ends up backing out of his promise to greenlight Karen's novel. The novel itself is at the center of another example of foreshadowing. In Scene 1, Fox picks up the novel, The Bridge, and says in jest "Why don't you do it? Make it." A few lines later he suggests "Instead of our Doug, Doug Brown's Buddy film." Gould agrees with him, also in jest, saying "Yeah. Icould do that."