“Haunted Mansion” (** out of four) was a thinly conceived horror comedy about a single mom (Rosario Dawson) who hires a variety of religious and spiritual folks (Danny Devito, Owen Wilson, Tiffany Haddish, and others) to exorcise her new mansion when she finds it’s inhabited by ghosts. Lots of expensive effects but little story or wonder (or laughs) to hang them on. Game cast helps to try to keep it watchable but film itself is “haunted” by the memories of the similar (and better) “Casper” and “Ghostbusters.”