I talk to myself about the purple section - only present on Silver Sails and Golden Gate.  Putting three balls in this section would start a Golden Game, which moves the screen all the way to the left, and exposes several different gold sections.  If you put two or three balls (depending on what is highlighted on the backglass) in the golden sections, you win the golden replays (single odds shown in a separate area of the backglass from the normal odds).
 
I also discuss some more tech sections and begin moving to the more mundane - lamps, playfield parts, and pinballs.