When Bull is talking to the police officer after the TAC centre is sealed off, the officer's shoulder flash on his right arm is back to front. US Flag code states that the stars on the American flag must always face forwards.
When Bull and his client stand on the steps of courthouse, the sign above the door reads Supreme Court, the trial court for the state of New York, yet it was established early on that the client was arrested by the FBI and the trial was in federal court.
Due to the episode's anthrax scare, Taylor had her mail held until the culprit was apprehended, as a safety measure. However, holding the mail doesn't prevent attacks, it just delays it, an undetected trapped envelope would simply be laying in wait. Marissa would still be cautious about opening a mystery greeting card from the danger period, to prevent what happened here.
Also, Bull and Benny are too smart to believe this incident would help their case, the entire bin of mail is from before Dr. Reznick's arrest (the arrest which triggered Taylor to end her hold on her mail), meaning it in no way would prove Dr. Reznick wasn't the culprit.
Also, Bull and Benny are too smart to believe this incident would help their case, the entire bin of mail is from before Dr. Reznick's arrest (the arrest which triggered Taylor to end her hold on her mail), meaning it in no way would prove Dr. Reznick wasn't the culprit.