John, not sure exactly what happened but it looks like condensation could be the problem. Since you can reshoot, no big deal, but you might want to keep the film warm, if not the camera and gear. I've heard of people using a snorkel in cold weather to keep things from fogging under the dark cloth.
One thing for sure, your exposures and development look to be doing very well. I like the contrast in this shot and textures. Well done. Perhaps someone can explain the spots. tim