Try your hand at Backstage Betty's theatre quiz (http://www.channons.com/betty/).

The lighting design may not be something you think a lot about when you see a show, but a good light design can help involve you emotionally in a play. Look at various production stills with an eye towards the lighting design (http://www.palazzolighting.com/theatrical.html, http://www.bluehilldesign.com/theatre_lighting.html). Now look at the work that goes into designing the lighting for a show (http://www.northern.edu/wild/th241/ld11.htm, http://www.creativemercenaries.com/woodslightplot.html).