Sara is waiting for Greg to finish up the results of a test in the DNA lab and snatches the results as soon as they come out of the printer without giving Greg a chance to sign them. Yet in the next scene, when Sara hands the paper to Grissom, Greg's signature can be seen on the bottom left hand corner of the page.
One shot of the bus' speedometer shows the make of the bus to be MCI. Later, at the bus garage, a shot of the front of another bus shows it is an MBI.
While Sara and Warrick are talking through theories at the site of the bus crash, the same car gets detoured twice, once at the beginning of the scene and again at the end.
When they examine the Camaro at first, it is a second generation model (1970-1981). When processing it is a third generation model (1982-1992).
When Grissom is looking at photos of the bus passengers the picture he identifies as Tracy Logan is NOT Cara Buono, the actress playing the part of Tracy.
The investigation of the crash would have been conducted by the NTSB- possibly with the aid of the Las Vegas Crime lab, and once the idea of a criminal act was discovered, because the bus was engaged in interstate commerce, the FBI would have taken it over.
All the Mojave Express buses have Mississippi license plates.
When Grissom says they need a treadmill to test a bus tire part of a camera can be seen for a few seconds.