How does the author use foreshadowing in The Real Thing?

In Act I, Scene II, the business with the vegetables and dip provides a vehicle for the expression of many of these undercurrents, triggering opportunities for Henry and Charlotte to express their resentment, Annie to express her desire, and Max (through accidentally cutting himself) to subconsciously express his vulnerability. In fact, his injury metaphorically foreshadows the emotional wound he experiences in the following scene when Annie leaves him.