Jesse Tyler Ferguson and Hamish Linklater discuss playing Dromio and Antipholus in “The Comedy of Errors,” one of this summer’s Shakespeare in the Park productions. The play concerns two sets of identical twins who were separated as children and now live as master-servant pairs in rival neighboring cities. It’s an enjoyable mess of mistaken identity, wrongful imprisonment, questionable flirting, and general mayhem. It’s playing at The Public’s Delacorte Theater in Central Park through June 30.