Piggy Bank doesn't dissapear
I was lucky enough to find a floating piggy bank. After it flew away, I traveled east and saw it again. This time I wasn't able to pick it up. I'm guessing it just didn't' disappear or something.

That is actually the correct behavior. Once it is found, it flies to a random new location. You are supposed to be able to see it again, but you can’t pick it up again for 24 hours. The piggy bank is in the same place for everyone in the game at all times.
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MrOnosa commented
Luke, yes it does. I must have missed that when I reported this.
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When you click on the pig, it tells you when you'll be able to pick it up again, right?
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MrOnosa commented
That makes since. There was no indication of that, though.