So tonight my friend, some randoms, and I, were doing the pop goes the weasel easter egg. on the last step before you go to the bridge for the final time we collected the parts and my friend was getting lag. So because he grabbed the part while lagging it was still on the floor but he still had it. we were putting the parts on and it woudln't let him put it on and we had to kill him so one of us could try. still wouldn't let us do it. so we put my part on and instead of putting it on it forced me to get on the plane. I'll upload a video tomarrow of it. TLDR:If you're lagging don't grab a plane part, or something will go wrong, and you possibly won't be able to build the plane.