How should I prepare for a research assistant interview as a cs undergrad?
From my experience, the academic setting is more relaxed on the interview. The interview I had for my GRA position had very few knowledge based questions. They want to see that you are highly enthusiastic about your domain of research, and that you're eager to learn.

If you have industry experience that is a huge plus! It shows you can actually work. I think one of the biggest fears of the lab director is a GRA/RA that is not able to accomplish much, i.e. losses motivation. Your industry interview will be more nit-picky about experience in a specific domain.

Being a GRA/RA is not like a course where you are told what to learn and when to learn it. You will be challenged to motivate yourself to solve research problems on your own time. It can be harder than industry in some ways, because you are given more conceptual work with no 9:00am to 5:00pm schedule to keep you active and focused.

I would focus more on touting your academic accomplishments. This assures them that you can handle a full course-load and research concurrently. I told them that I could not see myself working anywhere else, and that this line of research is the most meaningful thing I could be doing with my life. I didn't have to prepare that, because I meant it.

If you really what to know what the interview is like you can: (1) look online on Glassdoor or Reddit, (2) ask someone who is already in the lab what the interview is like.