Have you ever noticed an extra joint or tab on a toy that has nothing to do with transformation or the articulation of the figure? Example of an extra joint would be Titanium War Within the Fallen. His treads can fold up in robot mode even though you actually don't need them to. He looks just fine if you leave the treads in vehicle mode and you don't even need to fold them out of the way to transform him. Example of an extra tab would be any of the Generations Junkion molds. There are two holes in the seat so that they can ride each other. That part I got. There's also a peg on one side of the seat/leg that doesn't peg into anything and a hole on one side of the handle bar/leg with nothing to peg into it. It's not like you're going to peg the legs together and they don't fit together anyway, I tried. So why are they there? There's another topic for hidden features you discovered but this is more along the lines of things we still have no idea what they're for.