Okay, I encountered a weird bug and I don't know if I missed a puzzle in the game or what.
But early on I was at the plank of my ship and just clicked or double clicked Exit to Belly from there... instead of going to the belly it cut to mid-conversation between Guybrush and DeCava with DeCava saying something about his monocle thing and putting it down. So I picked it up and he was all "where'd my glasses go?" and then I put the manatee lens thing on it and gave it back to him... then after that they disappeared completely. He kept putting them down as if he was Wally or somethin', but they weren't actually there, he just made the motion.
So yeah, did I miss a puzzle due to this bug?