According to Bob:
Tsaria is correct that there is a piano visible next to the slide. The parrot was also kept in this room, and would screech loudly while someone played the piano and the children would go down the slide!
The car was never kept in the room until the palace was turned into a museum, and even then was moved around to different places during the 30s. If you look at the first picture, you can see the corner of the piano just behind the car.
The second photo may or may not be pre-1917, it is impossible to tell. It may be from the earliest days of Palace as museum, or it may be pre1917...no way to know for certain.