When Agent Boyle tells SAC Nazreen that he found the hard drive, he is actually carrying a power supply.
When Brian is looking into the professor's murder case he mentions there was DNA found under the victim's nails and says no one matched it in VICAP. DNA is kept in a database called CODIS.
Agents Boyle and Harris say they recover hard drives from a suspects house, when in reality the hardware they show is a power supply for a computer.
Part of the story depends on Brian being up all night on NZT, but it's previously been established that he only gets one pill per day, which wears off in twelve hours. He's often made to take it en route to work, which doesn't give him many opportunities to visit nightclubs, have one-night-stands, and establish on-line chat friends for brilliant conversations all before 8:00PM.
FBI agent Spellman Boyle says that they got Zheng hard drive, what he really pulled out of the bag was a desktop power supply.