Things the Coinstar machine decided not to count

Coinstar rejected the following items; the machine and I were both surprised to find these things in my coin jar:

A Hello Kitty keychain fob, a paperclip, a five peseta piece from Spain, a Darth Vader collectible coin from 7-11, and a button.

Just so you know, I've never been to Spain, I am not a thirteen year old girl, and I have no idea when I was last in a 7-11. The mysteries of the coin jar continue to elude me.