Okay well the only parts that are absolutely undeniably 99% useless are the McDonalds Galidor heads. You see that little thing on the bottom? No that's not an axle. No, it's not a pin either. It's this crazy rubbery hybrid of the two, made only for the promos. They went to the trouble of making this crazy connection point for these. I'm not sure if this went for all the sets/parts, as I only have that head, but I wouldn't be surprised. Also it does kind of fit into pin holes, but not evenly or securely. It being rubber doesn't help.