I had the framework of a lot of things in the demo, but many of them were not done and you discovered those, so good job! The other items were added for later use (and because I was learning to code in SCI0). I'm going to be adding right-click to look to the game, so that will (hopefully) make using the text parser easier to target specific things. And yes, lots of references to other Sierra games, which I enjoyed adding. The LSL2 one felt subtle, but if you played LSL2 you'd likely catch it.
The other mushrooms might also be used at a later point in time, but so much of the game was me discovering how to do things and the mushrooms were no exception. I'm glad that you played it and enjoyed it and thanks so much for the feedback!