Corrected entry: When Neal and Del are waiting for Owen, they discuss which credit cards they have. Neal says he has a Visa, gasoline card, and a Neiman Marcus card, whereas Del only has a card for a Big n' Tall shop. Neither of them mentions their respective Diner's Club cards, which they each just used the night before to pay for the motel.
Corrected entry: It's from a few of the scenes in Lambert Airport. Steve Martin walks into the terminal, his tie and shirt are soaked from the snow. His hair is a mess. He takes the tie off. After exchanging "F-Bombs" with the Car Rental clerk, he walks outside to catch a cab. Check out his clothes. He has on a fresh-new tie, new clean shirt and his hair looks brand-new.
Corrected entry: When Neal is waiting for the elevator at the beginning of the movie, there is only one call button for the elevator, indicating they are on the top floor that particular elevator can reach. However when the doors open there are multiple people already in the elevator. Nobody gets off, so these people would've had to go for an elevator ride to the top before heading down, which doesn't make sense.
Corrected entry: When Del gets back on the interstate in the wrong direction and the car beside him is yelling at him and honking their horn. Del blows the horn back and about a minute later blows it again yet it's a different tone.
Corrected entry: Automobile fires don't go out by themselves. Since the fire department doesn't come to the scene, the car would have burnt to a bare hulk. If the fire department had come to the rescue, they would not have allowed Del and Neal to drive away in what was left.
Corrected entry: Right before Dell looks over the damage to the rental car, there is a car seen approaching in the distance. After he examines the car, when he and Neal go to retrieve their things, the car is no longer there and it never passed them.
Corrected entry: Not necessarily a mistake, just a nice irony. After Del steals Neil's cab, his briefcase is run over - by a vacant cab.
Corrected entry: In the bus when Del suggests everyone sing the theme to "The Flintstones" the audio sounds as if everyone (or at least many of the people) in the bus sings along. But immediately thereafter, a brief shot of the people in the bus (actually, just the people behind Del and Neal) shows everyone sitting quietly, not singing, and not even looking towards Del who is singing.
Corrected entry: Throughout the film, Dell 'loses' his big trunk. This usually happens after they argue, or Dell has to shoot off to barter with shower curtain hooks.
Corrected entry: When Neil finally gets home, he and Dell ring the doorbell and Neil's daughter answers the door. In the background Neil's father-in-law can be seen holding Neil's youngest son. But when he introduces Dell to everyone the baby is gone. Neil even says "...and somewhere around here is my baby boy."
Corrected entry: In the final scene when Neal introduces Del to his wife, she says, "Hello Mr. Griffith", yet Neal never once told her his name.
Corrected entry: Neal's wife is shown in bed watching a movie on television. You cannot see the screen but you can hear the movie. It's "She's Having a Baby", also directed by John Hughes. The catch is that "Planes..." was released in theatres 4 months BEFORE "She's Having a Baby", so how could she be watching it on television?