Kind of, but remember the mistake that a lot of people make is to take a passage from Emma, find the corressponding scene in Clueless and talk about how they have been changed in talking about the similarities and differences.
It is important to say how the differences in the text have come about BECAUSE of values and attitudes.
for example, during emma's time the "nouveau riche" (those who have worked their way into being rich) were not generally accepted - Emma's wealth is inherited, and she is greatly accepted as a result of it
In clueless, Cher's dad is an example of the nouveau riche, and he is accepted as a result of 20th Century values and attitudes.
When i say talk in "general" i mean that as an introduction you could be talking about how in a text certain things are important because of the attitudes at the time.
i hope that helps - sorry this post is a bit late, but let me know if you have any problems