Under-construction visits: what did you actually check?

Honestly, I'm kicking myself a bit for not paying closer attention during site visits. Just got possession of my flat in Panchsheel Pratistha a couple months back, and some small things are already popping up. I'm thinking about future resale value and tenant attraction here. Like, how much can you *really* tell about long-term construction quality when it's still under construction? I mean, I saw the sample flat, but the actual building feels different. Specifically, I'm worried about the internal wiring for power backup – is it full flat or just common areas? What were the key things you guys checked during under-construction visits that actually helped avoid issues later? Did you look for specific signs of good or bad quality beyond the facade?