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Halfway through I realized that it doesn't specify how to slip you stitches, and I was slipping "purl-wise" on both right and wrong sides. Then I switched to slipping "knit-wise" on the right and "purl-wise" on the wrong sides. I don't think it looks much different, though.
(It was easier for some reason)
We're all a little tired of the mosaics, so we're going to jump to S17 and then come back to S12. However, by the looks of it, the slip stitch ones don't appear to be much different than the mosaics.