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We also noticed that nobody tried to rearrange or delete photos. We didn't give these specific instructions because we wanted to see if it was obvious that this could be done, but we realized we needed a better affordance so users knew it could be done.
Another problem our users brought up was being able to label groups of friends to allow for easy sharing when new circles are created. One user also brought up the issue of having circles with the same name. For example, if the user created a circle with one name, there is nothing stopping the user's friend from creating a circle with the same name and sharing it with the user. The user asked for a way to easily differentiate between these circles.