1.) General Guo is shocked that Yang's family is getting special treatment. He is shocked because this shows that the Emperor is being taken advantage of and shows the weakening of the government.
2.) Chang E informs us that Yang is a reincarnation of the Jade Consort of Peng-lai. She also introduces Yang to "Rainbow Skirts."
3.)The differences between the situations of the musicians in "Melody Theft" as opposed to "Ballad" show how life has changed due to An's rebellion. Liu Gui-nian goes from being a revered court musician to a mere street musician because of it. However, this did allow Li Mo to learn "Rainbow Skirts" properly and legitimately.
4.) "Bringing Her Fruit" demonstrates the harm the emperor's infatuation with Yang is having on the people. He is so desperate to please her that he'll rush his delivery men to the point where they trample fields and people. It also foreshadows the downfall of the Emperor due to a Yang (though not Lady Yang directly).
5.)"Gift of a Meal" shows how much the Emperor has been affected by both Yang's death and his own flight from the palace. The emperor is now in need of the help of a commoner and forced to eat a plain bowl of barley when before he had been served delicacies every day.
6.) Li Mo references "Autumn in the Han Palace," comparing the Han Emperor's love of Zhao-jun to the Emperor's love for Yang.
7.) The Oxherd and the Weaving Maiden offer a paralell to the Emperor and Yang's eternal love. They sympathize with Yang and the Emperor and thus help their love last forever.
8.) The play doesn't seem any more sexist than other works of the time period, considering the social structure of the time. The play does have a distinct distaste for foreigners, which makes sense considering the situation in the Qing dynasty - being taken over by outsiders.
9.) Lady Yang's portrayal is mostly sympathetic. It's made rather clear that it was not her own fault, but that of Yang Guo-zhong. Only during "Stocking Viewing" is she directly held responsible for the success of An's rebellion. Yang also is the one that ultimately decides her own fate. It is her choice to be killed, since the emperor wanted to resist as long as possible.
10.) It seems like this story, if it were to be told in a way totally unsympathetic to Lady Yang, could be told as one of those where a woman uses her wiles to get in close with men in power only to decieve them later. I know I've seen movies with this theme, but I can't seem to recall any titles, unfortunately.