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One thing that disturbs me is grasshoppers initial flight gives no indication of the 'sad' mood revealed as soon as he has landed.
OK, I'll try to make him look sadder when he is flying.
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And what's grasshoppers motivation for thinking so hard at the end?
Well, first he is all sarcastic. "yeah sure, I'll just dip my 3 inch wooden leg into that GIANT funnel on your head and, if I can even reach the oil, I'll go about oiling your joints one tiny drop at a time. Sure thing buddy."
But in the next shot he does manage to get TinMan oiled enough so he can move, so Grasshopper is thinking about how he can actually accomplish that.