All the portals had same dimension, more like a 4x8 feet door at most. There is no way an entire car can go through it, as was shown at 7:55. if the car collided with it and stopped, then the 3 persons in the car never came into physical contact with the portal, so there is no way they could have gone into the portal.
They show entire Earth going complete black out within seconds. But The effect of any energy surge cannot be equally distributed all over the Earth, there are different power generation plants using different technology, some use oil, some use coal, some use water, some even use solar and wind energy, so they will be effected differently. And, there are captive power generation plants also supplying electricity to a limit users, and their capacities are far more that the peak load. Plus, billions of people now have home generators and invertors/ batteries. Thus, there just cannot be a complete blackout on Earth. If the surge is not really affecting power generating plant, and is rather directly affecting electricity, then all electric devices, even mobiles and cars would also have gone inactive.
Why would there be pistol lying in the drawer of a call center office that anybody can pick and shoot and kill anyone? Only security department is supposed to have all dangerous tools and weapons, under lock and key.