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)
Factual error: In the beginning of the episode, Hawkins' boss tells Hawkins the attacks will occur at 8.05am. Then a shot of children playing in daylight is shown, followed by the text "33 hours before the bombs" and a shot of the city hall in daylight. 33 hours before the bombs would be 11pm.
Suggested correction: The script says they will go off at 8:05, during the President's address. Presidents don't typically give speeches in the AM, they are usually done in the evening. Given the time zone difference, it makes more sense that it was PM - Jericho is supposed to be close to CO border which is MTN zone and 2 hrs behind DC. Plus the bombs go off while the school bus is returning from a field trip and no school is having a field trip at 6:05 AM.