The cast of “The Four Bills” took an enjoyable approach to researching their characters — they watched dozens of movies.“Well, maybe not dozens, but certainly close to a dozen,” actor Ian Salazar revealed with a smile. Salazar plays William Raidler, a lawyer in the 1880s who goes West for his health. “His doctor recommends the warm sun of Utah, rather than the cramped offices of Philadelphia, PA,” Ian notes. “At first Raidler is appalled, but then he sort of likes the idea. It’s a way for him to break loose.”All the characters in “The Four Bills,” the new musical production ...