Deep questions about data structures and sorting algorithms that are perfectly addressed by the standard library in JS iirc. I understand that virtually anything in CS is or can be relevant, especially for such a competitive role. I don't think one should limit their knowledge wholly to a specific domain, but it seemed like there was so much emphasis put on these kinds of concepts that there was very little time left to put emphasis on things that actually might be relevant in the day to day. Beyond that though, I can't say. That's all I got out of it.