With a floor, I'm thinking about what goes on top of it later, so the first thing I ask is what flooring you have planned. While we work, we keep the vapor retarder intact, because a torn spot under the slab can't be patched once the concrete is down. Finishing and jointing come down to timing, and I watch that part myself instead of handing it off.
The base is the part nobody sees on the day we pour, which is why it's the first thing people want to trim from a budget. I'd rather spend there than on extra finish work. We dig out soft dirt and pack the base instead of just raking it level, because a slab that settles with the dirt under it tends to crack and go uneven no matter how good the top looks.
We also check where water will run around the slab, so nothing falls back toward the house. If the new floor opens onto the yard, we can pour the concrete steps down from the door while we're set up, and the same attention to base and drainage goes into a concrete pool deck out back.