Answer:
I could only find 8.
1 roller skates
2 ZY
3 Shoe on desk leg
4 standing on head
5 George Washington
6 old man
7 desk turned around
8 missing head.
Before we recognized Abraham Lincoln, my brother and I used to pretend that since you are still in the classroom on the next page you can find 2 more. The mouse on the wire and the wire through the flower pot. Of course there are 3 because of George Washington again.
This has been bothering me to no end since I started reading it to my children.
9. the boy whose head is being stood on has no chair.