Revealing mistake: In the flashback scene in the bar, one of the girl scouts slams the other girl scout onto the floor and one can see the mat that the girl lands on. It had been covered in dirt or dust but when the girl lands it is swept away and you can see one of the corners of the mat. (00:16:40)
Revealing mistake: When the guy, who is sitting next to his wife, pukes into a bag, as he raises his head to puke again for a couple of seconds you can see directly into the barf bag and it's totally empty. (00:36:45)
Revealing mistake: Throughout the cockpit scenes, Otto's (the auto pilot) face is just painted, with no facial features sticking out. When he is about to fly the plane, he winks out the window, and turns his head. After he turns his head you can see the extra attachment on his left eye used for this. (01:22:40)
Continuity mistake: In one of the first establishing shots of the starring Boeing 707, the tailplane livery would suggest that the aircraft is a real-life Trans World Airlines (TWA) airliner with 'Trans American' and 'TA' merely painted on. However, in nearly all subsequent shots (such as that of the aircraft in the air), the tailplane design is noticeably different - the thick red square is now a thin red stripe instead. Also, a further red stripe now extends upwards over the fuselage just before the tailplane. (00:08:05 - 00:14:00)
Revealing mistake: When the doctor is removing the eggs from the woman's mouth, he actually has them in his hand, not taking them out of her mouth. A simple sleight of hand, but still noticeable.
Continuity mistake: In the scenes on the plane, the camera angle showing the seats down the left side (on the plane's right side) change from 3 seats to 2 seats, then back again. This is evident because the 2 black passengers who speak 'Jive" are seen in their seats with both 3 and 2, and not because it goes from Coach to First Class.
Continuity mistake: At the end when Elaine and Ted are standing on the runway kissing, the first shot of their plane can be seen in the background and it appears to be up off the runway on its landing gear, not lying flat on its belly. When Otto starts the engines to take off and the camera focuses back on the plane, the plane is back on it's belly like it was when it landed.