Although she didn't attend film school, the director has a sketch comedy background and enjoys stepping out of her comfort zone. (backstage.com)
This is another reason the film works, because you have the horror / comedy background of Whedon combined with the thriller / mystery writing of Goddard. (fatmovieguy.com)
Reed, Rudd, and McKay come with comedy backgrounds and aptly fit the tone, which is needed for the film. (paulstriptothemovies.com)