If your concrete has fiber-mesh or fiber-mix reinforcement, the top surface in some areas may have hair-like fibers showing. This is normal and will wear off over time.

Yes, control joints should be installed at a spacing of approximately 10'x10' to prevent random cracking. While such cracks are generally not a structural problem, they are unsightly. Avoid joint patterns that produce rectangular or triangular sections. Lay out your joints to form square sections. If in doubt, make the sections smaller, not larger. Ask your contractor to provide a jointing plan as part of their written proposal.