The philosopher Herbert Spencer once remarked that marriage is “a word which should be pronounced ‘mirage.’” In the new film “Couples Retreat,” marriage is certainly portrayed as if it were a distant mirage. This new comedy reunites much of the cast of the 2006 flick “The Break-Up.” Vince Vaughn, Jason Bateman and Jon Favreau come together again to play best friends, with Peter Billingsley, who plays their other friend in “The Break-Up,” directing them in this film.