Thanks for your feedback! Yes, there are a fair few failings in my game that I know of, that I didn't get around to fixing before I ran out of time. I'm fixing some of the smaller ones as I go along, hoping that not too many people are playing my game yet, but some things like the limited number of location graphics are probably not going to be a part of that. Adding a caption as you suggest may be a good compromise. I'll be writing a post-mortem in the next day or two and posting it to my 'blog, which will probably talk about several points like this.
The bookshop bug is one that I think I caught and patched just before I read your comment, so now hopefully Bartie won't find the book at all until he's met the collector. The "missing" scenery items might remain so unless/until I do a revised version after judging has finished, because as much as they break immersion, I don't think that they heavily impact the overall flow of the game.
I've also just added a hint system, which may help you if you're still stuck. Just type HINT at the prompt to see how it works!