Jolene Blalock's natural eyebrows are visible underneath her make up.
When Reed orders coffee in the mess hall, it can be seen that nothing comes out of the dispenser.
The discovery of a proving ground for the Xindi weapon belies the notion that they would have sent a test weapon to Earth. The idea that the Xindi would deposit evidence of their intentions on Earth before their attack plans were ready is unlikely, if they could have merely tested it at the Proving Ground.