Green balloon is moved; three balloons to the right of the white one are moved...
Correct - the Yoda ballon has moved and the three balloons to the right of the "chef" balloon are higher in the sky
+2
Behind the woman shading her eyes, there's a rivet missing from the trailer's side in the edited photo.
Also, the woman shading her eyes has just eaten a tuna fish sandwich on white bread in the original photo, but a ham on rye in the edited photo.
According to Carnac the Magnificent, anyway.
Yes, the rivet is missing
+1 = 3
In the second picture there is a flag missing from the big yellow balloon
Correct one of the black flags is missing
+1 = 4
In the second picture the writing is lower on the black balloon
Correct - the registration number is moved lover on the balloon
+1 = 5
Left: the white "vase?" balloon has two ears/handles; right, it's only got one.
Yes! The "chef" ballon is missing a ear.
+1 = 6
The women's hand in the lower right corner is brighter in the second picture.
No - or if it is, that is not one of the 10 intended changes.
left: the dark balloon in foreground has two white "gashes"; right, none
Correct - the "open parts of the lower part of the closest balloon have been filled in)
+1 = 7
The clouds are different near he big green balloon.
No - it bay seem that way, but the change is actually that the green "Yoda" balloon has moved up and to the right (as Mickey found)
left, the center bottom jacket is a duller red than in the right photo.
No - if it is that's not an intentional change - looks the same to me.
So far you have all found 7 of the differences - just 3 more to go. Here are some hints: 2 of the remaining changes are balloon related, one is related to the people (or a person) in the crowd