1. Inspect the placement of the steel. Things like distance from forms. location of the mat steel in reference to thickness of mat.
2. Look at the grade of the steel.
3. Look for proper laps of the steel.
4. Steel tied properly.
5. Depth and width of beams.
6. Depth of beam below undisturbed soil.
7. Any special conditions....piers. fireplaces.
8. Concrete encased electrode if using PEX or any other non-metalic water pipes.
9. Moisture barrier
10. Protection of pipes passing through beams.
11. Minimum thickness of mat. String across entire slab to verify thickness.
12. Check the achor bolts on site for proper length.

Probably a few more but that's a good start right off the top of my head.

The TRCC is going away so they will no longer accept inspections after August 31. 2009. I have heard a rumor the Texas Department of Licensing and Regulations is taking this procedure over. We'll see!