Across the country, followers of pop culture are marking the 25th anniversary on Monday of the movie “Pretty Woman,” and recalling the unlikely romance between a businessman played by Richard Gere and his hired escort, played by Julia Roberts. Television networks are airing the movie, one of the most successful romantic comedies of all time. The movie’s Los Angeles hotel is commemorating the film with a “Pretty Woman for a day” experience, complete with a Rodeo Drive shopping spree.