This play may be difficult for ESL students with all the idioms and references to cultural knowledge.  I would go with something like Amy Tan's excerpts of her books and then watch the film, although you will have the same problem there.  Not all your ESL kids will be familiar with Chinese culture.  THis is a good thing to talk about though...get them brainstorming the differences in culture and how they deal with greeting people, death, weddings, etc. that are universal.  THen dive into plays like Fences by August Wilson, and maybe Twelve Angry Men.  Great play, good film.

Good Luck!