The PASS clues are the most high yield info in terms of what's on UWorld and the NBMEs that needs to be memorized. The faculty went through every single previous UWorld question and NBME and figured out exactly what are the keywords you need to know get the answers right. Then they added the very basics of what you need to know (ex: Q: What does the anterior pituitary secrete? A: acidophils - growth hormone, prolactin, basophils - fsh, lsh, acth, tsh), so you keep your mind organized when approaching a question. The "big" PP clues is about 50 pages has been out since the program started (which was about 20 years ago) and the "small" clues is about 10 pages came out a couple years ago I think.
I believe they added the small one to compete with DIT and add some extra info that is incomplete in the DIT course, but I never asked, I am just assuming. I've watched some of the DIT videos and the small clues has more info than it. For example they talk about cardiac markers in DIT and they just say Troponin I is first, CK-MB is second and LDH is third. No time markers. The small clues say Troponin I appears at 2 hours, peaks at 7 hours and disappears at 7 days. CK-MB appears at 6 hours, peaks at 12 hours, and disappears at 2 days. LDH appears at 1 day, peaks at 2 days, disappears at 3 days. So by knowing the timing, you can see why taking a troponin-I marker at day 4 is silly, because it could make you think the patient had a second MI, when it's just the first marker that hasn't worn off yet. A CK-MB marker would be better at day 4 because it should have disappeared by that time. That's exactly how UWorld asks the question. See how DIT can be vague if you don't know the proper content?
The large one is divided by subject so it's easy to drill with a partner every day, the small one is a hodgepodge of HY info in very tiny print, double sided to maximize space. Also I am not trying to put down the "Bros" deck, but the first card I tried was asking about septum primum and septum secundum, which was great, but it mentions nothing about which septum caused the problem and you should be concerned about if the patient has an ASD (A: it's the septum primum, think of it being the "premiere" or "1st" one to move). The PASS notes mentions that very succinctly in 2 lines when they are talking about ASDs. What is the point of memorizing septum primum/secundum if you don't know which one causes the problem.
When we took the PASS course, the small version came no charge, and the large version they asked for the cost of printing it, which was $7.00 I believe. The large clues are also integrated into the Notes as a sidebar for each topic, which is cool because you can read about the topic and understand it and then quiz yourself with the clues on the side. Maybe you can call them and ask if they can mail it out the actual packet to you if you pay for it? I don't know what their policy is on it if your not a student.
