If I remember rightly, Ben was going to have some kind of weird dream inspired by native american mythology (e.g. the cayote, like in that Simpsons episode).... the idea was returned to, in another form, for Psychonauts.
Interestingly, Full Throttle was strongly criticised by some reviewers when it came out because of its length. PC Zone summed it up by sauing "in the days that LucasArts could do no wrong, they did wrong" (or something to that effect). Now it's practically an advantage of the game, that you could play it through in one sitting if you wanted to. But then it is a lot cheaper to buy now.