I had a strange phone one recently too. I entered the Smith lot and the phone notice came up saying "do you want to invite Johnny over" As the active sim was a toddler, his baby sister born after he left for Uni I thought it odd, and hit yes, The next message was to the effect that Johnny was busy and couldn't come now. I checked the other sims in the house and they were asleep, so no one was on the phone
I have noticed one or two other odd things, mostly to do with the Nanny. In another thread we have decided to blame the latest patch for those.