The music played when Sophie was showing her moves just stops playing when she disappears in the back and her tablet, where it was coming from, just vanishes from the store.
Caroline is suddenly confused about what happens on a third date, when she thinks it should be happening on the 10th date. However, in S3 E8 "And the 'It' Hole", Caroline tells Sophie that she doesn't need her grab bag until her third date (meaning she knows what happens).