“Do you know what Dr. Johnson said? Guests, like fish, begin to smell after three days.” “I think you’ll find I start to stink even sooner than that.” This exchange pretty much sums up how I feel about Barcelona; it has moments of sharp wit and sarcasm, wonderfully brought out by Chris Eigeman, but the final section drags, which brings to mind that third-day feeling. The movie, centering on two young America…