The scene in "Galveston" plays out with the feds communicating by radio, yet the Mobile skyline is evident with the RSA Battle House Tower (the building with a Chrysler Building "look") apparently poking up through the trees. the flattop Moody Plaza is the tallest building in Galveston at 358 feet, less than half as tall as the RSA Tower which is 745 feet. The scene appears to have been filmed near Meaher State Park, near Spanish Fort along the US 90/98 Causeway, but I am not personally certain of this. In any case it leads to much confusion to astute viewers, even those not familiar with the landmarks.
Toward the end of the movie, when all but one of the hostages (the driver) are released, and Vaughn escapes, the liveries/uniforms on the ambulances, EMTs, and other emergency workers state "MOBILE FIRE RESCUE". as in, Mobile, Alabama. This is incorrect chronologically as the destination of the bus was Galveston, Texas. At this point, since the bus was now in Galveston, all emergency personnel and equipment should be so indicated as being from Galveston.
Toward the end of the movie, "Dog" calls the cell phone carrier to find out if there had been any calls made to Texas. The person on the other end of the line says yes and proceeds to give him the number which has the area code 405. 405 is an Oklahoma City/central Oklahoma area code. Since the line he calls is a land line, whose area code should be 409 for Galveston, and is not a cell phone, this is not possible.
The bus had to have been driving in one direction down the interstate for a minimum of three hours or more, since they were picked up before 4:00 AM and there was bright overhead sunshine when they finally stopped for refueling. Yet officer Kris was sent from the origin city with a gas truck after they requested fuel and was already waiting for them on the bridge.
When Cox appears to shoots the Bus driver in the head, he is standing next to the seated driver with his gun aimed 30-45 degrees downward. When the shot occurs - which we only see from the POV of the news helicopter's camera - the upper part of the windshield gets covered in blood. We later learn that not only is the Bus driver still alive, he (like the other hostages, who had seen that Vaughn was trying to protect them all along) helped Vaughn escape. And at the end we learned that there was a lot of misdirection in Vaughn's plan, in keeping with the film's recurring 'card trick' theme.
Vaughn has no money, hijacks a bus, is on the national news, and suddenly gives a hospital $300,000 and no questions asked - Fact - No hospital would accept that amount of cash without a paper trail or from a person involved with Vaughn who participated in: murder/kidnapping/hijacking a public bus/cop killing/endangering the welfare of others/grand larceny/and more. The whole police force was involved and there is no way this could have gone down and the hospital would have to return the money that they would never had accepted anyway.
Towards the end it was revealed the pregnant woman was in fact a plant and she wasn't pregnant, but how did Vaughn know they would get the bus to escape when they had an escape car at the ready? He wouldn't have.
Towards the end a lot of petrol is poured over Vaughn by 'Dog', who is then shot by The Pope, but then Pope lights up a real cigarette right next to the place where petrol was poured. Just by the fumes alone he would have gone up in flames.
Vaughn was in a good mood when gasoline was being poured over his head, in his eyes, before about to be burned alive, it is also not a good idea to light a match in a confined space with gasoline all over the floor, they all would have burned.
The goof items below may give away important plot points.
In the final scene in the bus, so much petrol was pour onto Vaughn's body the, the bus would have been filled with petrol fumes, and yet when matches was struck twice and the subsequent firing of a pistol, nothing ignited.The mixing ratio of air to petrol vapour may have been too low, preventing ignition, but would also risk asphyxiating all inside the bus. It was clear that it was water being poured on Vaughn's head, as his eye were wide open as the petrol running down his face.
The pregnant woman on the bus was planted there by Vaughn, how would Vaughn know in advance that the get away driver was going to flee Vaught told them he wold be on his own after the heist. Secondly most buses do not run on time, and Vaughn and the rest of the gang had a gun fight before they got out, even if Vaughn can predict his get away driver was going to flee, it is impossible to time the arrival of the bus because of the unpredictability of the gun flight. This is not a mere plot hole, but a gross error by whomever wrote this screenplay.