was not a registered trademark, the comic book company prevailed in court based on its common law trademark rights. This same rule may hold true under trade dress principles -- that is, even if you don't use the name of the bar. Bottom line, we can't tell you whether you will get hassled but you might want to get a second opinion from a trademark attorney before investing serious dinero in the project.
What about copyright? Copyright does protect characters and settings provided they are distinctly defined -- that is they must be more than what are known as scénes à faire.
P.S. Dept. Also beware of including any replicas of actors from the TV show in your bar setting.