A couple of little tips which definitely helped me (the kind of things that won't make the difference for you, but can definitely help get you there):
1.) Get a smart phone. At every callback, there was at least one 15-minute stretch where I was just sitting there waiting for someone. This is the perfect time to poke around the website and take one last look at the bios of the attorneys who will be interviewing you or come up with some kind of interesting question to ask them.
2.) Be conversant in sports. If you're a guy, I think it can actually hurt you not to know anything about spots - being able to shoot the breeze for 10 minutes here and there about the Giants or the 49ers isn't going to get you a job, but it helps to show that you're an affable person and establish that relationship that could lead to you getting an offer. Most, --seriously, over 50%-- of my male interviewers, just started talking sports at one point and it was clearly expected that I could hold up my end of the convo. Fortunately, I enjoy sports so this was no problem. If I replied with "What's a football?" things would have gotten quiet. If you're a woman, I think it can be even more helpful to know something about sports because your interviewer will be pleasantly surprised (I realize that's a bit sexist, but it's also true, so take it fwiw).
This is especially true if your interviewer went to the same UG as you, and its a school with big sports programs. Happened to me twice at CBs with partners, got offers at both, and my relationship with one resulted in me accepting their offer. Who would have thought sports would be the difference-maker...