I noticed three things.
- Mia and Tia show up behind Skipper and Sparky, watching the air show. (left)
- In the bottom right corner of the picture at right, the plants there seem to make an airplane front with propellers.
- And WHAT was that at the end?
- "Mater: "Ha! That was fun! Hey, they ought to make a whole movie about planes!"
Sparky: "Say, that's a good idea, Mater!"
- —Mater and Sparky at the very end
Hmm. I wonder what that could be referring to? Could it possibly be PLANES!?!?!?