I was going through Keelhaul Key a second time, with Ms. Mowz, to get all hidden things (Shine Sprites and Star Pieces) but I got stuck in the cave where you find the 50-something stranded Toads. On my second run, the switches in the background are missing, and there are no barrels between the paper boat platform and the rightmost ledge; therefore I cannot exit this area. If I get back to the left, there are no paper boat platforms either, since I came from the waterfall.
Can anyone confirm this bug? FYI in my current game, I just finished the Poshley Heights chapter.