According to what I read in the P5 Manual, the minimum displacement bound should define the offset of an expanded bounding box [sic] beyond which displaced vertices are clipped, potentially leaving holes in the mesh. I've set mine to 1.0 and it doesn't seem to have made the black spots go away, so I'm trying increasing the shadow bias of the lights and reducing their intensity as suggested by face_off and ynsaen. I was seeing an extreme example on lilflame's round sofa until I turned off polygon smoothing for it. There may be something similar happening on the figures. The sofa also has a displacement map, but interestingly its effect is only visible in the reflections of the sofa, rather than the direct path to camera view.

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