The Cat or not the cat & the knocking on the door.

I was just informed from Karen to watch out for things today. This morning while she was getting ready for work and standing in the diningroom she seen the cat scratching at the playroom door and heard him also. When she turned around he was sitting in the kitchen(solid imitation). Also while she was upstairs she heard knocking on the inside of my oldest daughter's bedroom door and she is not in there and the door is shut and locked.