(At around 40 mins) Lisa Ianelli is headed Downtown on the 4221 bus but gets off a bus numbered 4170.
The younger Jason Nichols has brown eyes and the older version has blue eyes.
Scully uses an electronic ear thermometer to take the temperature of the dead campus security cop, which turns out to be 15 degrees Fahrenheit. However, electronic body thermometers don't register subfreezing temperatures.
The compound shown on screen twice is 1,2 dichloroethane. This compound clearly wouldn't match the NMR spectra that was present with Dr. Yonechi because it would only have one peak versus the many shown in that spectra. Also, 1,2 dichloroethane clearly does not exhibit any of the properties claimed by the characters.
Scully introduces (at 14.35) a chart, thus: "This is what's called a nuclear magnetic resident spectra." In correct English construction, the suggested singular should be "spectrum"; spectra are plural. At her level of expertise, also being a doctor, Scully would know this.