1)Maybe she forgot her keys inside the car.
2)Probably that woman accidentally threw something that she needed in that dustbin, and she was trying to get it back.
3)At midnight, on Friday, it is not so normal to take a walk with a suitcase in your hand. The police officer stopped him and decided to talk a little bit with him because the suspect looked suspicious.
4)Maybe those people had a party last night which lasted till the morning, and they didn't have time to change their clothes.
5)Maybe the neighbour went to a pyjamas party in the neighbourhood and he came home late, and he entered through the window because he didn't want to wake up the members of his family.
6)Probably the young man was not feeling good at all, maybe he had a stomach ache.Or, maybe he had a fight with someone and he was hit so hard that he could barely walk.