Character mistake: When Tommy is being shown his new office the glass reads "Thomas R. Callahan III, " but when Tommy is introduced as the new President of the company he is introduced as "Tom Callahan, Jr." which would be his dad. (00:11:35 - 02:11:55)
Character mistake: When Tommy is looking at his grade, the names are suppose to be in alphabetical order. However, "Blackburn, William" appears after "Bollen, Max" when it should have come before.
Factual error: When they get on the flight to Chicago, it's an American Airlines 747. No airline in America would fly a 747 from Ohio to Chicago, a 1 hour or so flight. No one would waste the amount of fuel and costs to fly a plane that big full of passengers for such a short flight.
Visible crew/equipment: Filming equipment is reflected in the window of a passing car in the scene where Tommy is relieving himself on the side of the road.
Continuity mistake: In the last scene of the movie Tommy is sitting in the boat on the lake with no wind. As he talks to his dad there is no rope above his shoulder in the pulley at the end of the boom. After the wind picks up and he gets hit in the head with the boom there is a rope on the pulley. (01:32:30)
Continuity mistake: When Richard and Tommy are trying to sell brake pads and Tommy eventually catches the model car on fire, Tommy eventually sets a blue model car on a pad of paper where a couple of things happen. First, when Tommy says "I CAN'T STOP!" the right front tire on the blue model is all of a sudden bent outward. After Tommy destroys and catches the other model on fire, not only does the tire fix itself, but the car changes positions on the pad of paper numerous times.
Deliberate mistake: Why would Richard, big Tom's 'right hand man,' have to drive his cherished vintage car on a business trip that would take him hundreds, if not a thousand miles? He surely could have taken a company vehicle. Of course, then they couldn't do the 'car slowly and humorously being destroyed' shtick.
Continuity mistake: Right before they hit the deer, the car's windshield is gone. After they hit the deer, it has returned.
Suggested correction: It is possible (probably not common) to be a "III" and a "Jr." If you are named after your father, and he is still alive you are a Junior. If you both share the name with another member up the family tree say your great grandfather, then your father would be a "II" and you would be a "III." But since your father is still alive, you can still go by junior. I've known one person in this situation.
I guess you missed the part of the movie where his father died. He's made the new president because his dad is dead, not alive, negating your main point.
Bishop73
His dad literally just died, and most people don't know the specifics of the naming rules. That would be a character mistake of the person introducing him.
When Tommy is made president and introduced, that's at the end of the film. So, no, his dad didn't literally just die. Plenty of time passed. But the correction is wrong on its premise, but that's not to say a different argument couldn't be made why the mistake is wrong.
Bishop73