Curiosity shows a desire to question with the intention of improving something, and identifying weakness paves the way to reflection and improvement. Both are key qualities that when employees posses them can drive a business to succeed. Measuring and testing them at interview can be challenging for the interviewer, but if you feel you possess these qualities, demonstrating them at interview with examples is a good way to evidence them. Looking up your interviewer and the company on sites such as LinkedIn is a great place to start. 

If you are curious, you'll continue to learn. If you identify weakness, you'll already be closer to overcoming it and these are certainly ingredients for success.