Factual error: When the girls input the thing they call an IP address, it is not an IP address. The numbers are out of range (0-255). This isn't like a "movie" phone number - the address they use is fundamentally impossible. (00:06:05)
Continuity mistake: In the pilot episode, Jake mentions that he's 32 years old. In "Federal Response", his passport shows a birth year of 1977, which would make him either 29 or 30. (00:38:45)
Continuity mistake: After Jake has seen Hawkins through the scope, he lowers it down to his hip in the long shot. Cut to a close-up of Jake, and he is suddenly holding the scope much higher, at shoulder height, without any time to move it back up between shots.
Audio problem: When Hawkins asks Jake if he needs help putting out the third fire, he uses his hand to stop Jake from opening the car door a couple of times. The first time he does this, the thump of his hand is heard a split second before his hand connects with the door.
Answer: According to Wikipedia: "It was a cross-section of 'domestic militia, anarchists, and religious fanatics' – terrorist groups that would never ordinarily collaborate, ideologically or politically. The only thing that connected them was the desire to take down the federal government of the United States. The entire plan was orchestrated by someone with deep resources, an ability to coordinate diverse groups, and by all indications, an American. After someone (believed to be Thomas Valente) tipped off the terrorists about the government's knowledge of the plot, they moved up the timetable for the attacks."
lionhead