Corrected entry: Without a valid ticket/boarding pass you can't get through security, much less on board a plane. As Roger did not know he was "supposed" to go, he wouldn't have had a ticket.
Corrected entry: At one point, at the parking control HQ, a report is being typed, describing a car in violation of parking as a 2 door sedan. A sedan by definition is a 4 door. A 2 door would be a coupe, sports car, anything but a sedan. As parking control officers, the description would have to be uniform, to avoid having tickets thrown out over inaccurate descriptions of the vehicle, so it would not likely be a character mistake.
Correction: http://www.answers.com/topic/sedan-1 Several versions of the body style exist, including four-door, two-door and fastback models.
Correction: Dr. P (Billy Bob Thornton) gave him a ticket.