The first crawlspace was the area where you had to crawl under a narrow arch to get to a blue potion. I saw the crawlspace, but I didn't know how to crawl, so I ended up going all around the map until I realized I had to press C. For the first cauldron (the one where you had to mix red and blue to make a magenta potion), I got stuck because I assumed the cauldron was decoration, and that I just was not finding the magenta potion. Love the game, though; I will go back and finish playing soon!
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Now that is odd. You can crouch in a couple of places, but they should only let you access a time powerup and a shortcut, not potions..??
You can reach to a blue door area via a crawlspace, is that where you are referring to? That is an optional path, which is a part of a puzzle to create a shortcut ;)