Inside the RAR, not inside the video file (not sure what you mean by that really). Most posts have NFOs, SFVs, SRRs, NZBs, samples etc outside the main RAR archive where they can actually be useful (don't need to be unrared, but can be moved automatically from dl to unrar folder with that option set if you want to keep them), and the only time I find lots of junk inside the archive is when it's a dodgy post to begin with, like RAR within RAR (I then stop using those sources). It's hard to know what your exact issues are without seeing an actual example of an NZB, but my guess is that you've been pulling from different posters recently and that's why you're seeing these different results.
Yeah, the second part of that script should work just fine ...