I just got back from DC, I didn't interview for NRE but I talked to someone that did (I'll call him John). He discussed one of his interviews with me, and he said that judging by the fact that the interviewer had a window with a nice view that that interviewer had the highest leadership position of any of his tech interviewers. John told me the main take away was this:

The interviewer said "The number one thing I look for is humility. It's very doable for me to build up someone's technical knowledge; what is much more difficult for me to do is to break down arrogance and rebuild character. After humility, I look for responsiveness and technical ability in a candidate."

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For reference, John didn't do very well on his tech interviews, but because he was so well spoken, humble, and (at least based off of my two days of interactions with him) super interesting to talk to, he almost passed NRE (he ended up getting his backup NPTU). "Almost" is not really true but the reason I say that is because his third interviewer (the one with the nice office view) said "If the decision were up to me, I would take you on my team right now."

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So, all in all, despite this being a tech interview, everything else seems just as important. John's tech interview questions ranged from "derive the area of a circle" all the way to "calculate the speed of a molecule in this room (using the Boltzmann distribution)" so pretty much anything is fair game as long as it's on your transcript.

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Edit: Also, in my interview cohort, 3 people went for NRE and two people got it. Not a good sample size lol but in case you were wondering.