I think the staging of the play is easy. The Ogre's hut may be but a shallow front scene, a curtain that can be drawn away. The masks are such as might be used by Wrenboys, little paper ones, such as one finds in a Christmas cracker, held on with a bit of elastic, and would help to get the change into the eyes of the audience, which Manannan's Mullein-dust may not have reached.