Often actors will imagine the life of their characters outside the text of the play in order to get into their roles. They call this "creating a back-story." It is based on the actor's imagination and understanding of the text. Choose a character from The Comedy of Errors, and imagine that it is now five years before the play begins. How old are you now? Where do you live and with whom? What are your current hobbies? Your relationships? Have you led a tough life, or a relatively easy one? What are your concerns about your life? Your dreams? Remember that your choices need to be based on the "facts" you learned in the play.
Pick a character from a book you've read or a movie you've seen recently and build a back-story for that character, too.