Continuity mistake: When Del comes out of the passenger side of the dairy truck, he is seen with a black eye, for no reason. The next scene, it is not there. It is there again when he admits to being homeless.
Del and Neal make it to Chicago and Neal boards a commuter train for home. While on the train, he thinks about his journey with Del and certain things he said along the way. Sensing something doesn't add up, he goes back to the train station to find Del still sitting there. Del confesses that he is in fact homeless, and Marie (his wife) passed away eight years ago. Neal brings Del home with him to spend Thanksgiving with his family. In the post-credits scene, the executive who was debating which picture to choose is actually still trying to determine that, with a Thanksgiving meal present on the table in the conference room.
State Trooper: What the hell are you driving here?
Del: We had a small fire last night, but we caught it in the nick of time.
State Trooper: Do you have any idea how fast you were going?
Del: Funny enough, I was just talking to my friend about that. Our speedometer has melted and as a result it's very hard to see with any degree of accuracy exactly how fast we were going.
Trivia: When Neal's wife is watching TV in bed, she is impossibly viewing the John Hughes film "She's Having a Baby," which didn't even premier in theaters until February of 1988, three months after "Planes, Trains and Automobiles" premiered in November 1987. John Hughes (who directed both films) used his own unreleased "She's Having A Baby" footage/soundtrack and a cameo by Kevin Bacon as teasers for the upcoming 1988 film. There's still some speculation that the plots of the two films actually intersect, and that Kevin Bacon (who is credited as the Taxi-Racer in "Planes, Trains and Automobiles") was playing his character, Jake, from "She's Having a Baby."
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