I've taken a few screenshots. Some bizarre occurrences. Floating guitar and... invisible Duck?
I've already used the spike thingy to remove the spike. Then whenever I re-enter the boxcar, the scene introducing Chuck replays. I'm nut sure what else to do.
EDIT: Eh. After a restart, everything seems to be fine. I'm still getting an invisible Duck. I'm thinking the game prefers it if you did the steps in a precise order.