Asked about things that were actually useful to the job. Practical pen and paper testing, math, blueprint reading, measurement skills. I never got to do the lego test in my actual interview, they added that later and used me for a sample after I was hired. As silly as it sounds, legos are a really good assessment of necessary skills- dexterity, following directions, attention to detail, spatial rotation. Plus it's funny, so you relax a little.