After the mechanic steals Jerry's car, Jerry is using the payphone and you can see his Saab is still parked in the mechanic's garage.
When Jerry and Elaine are driving back from the auction, the street shot shows the wrong Saab 900. The vehicle shown on the street is an older model, like Jerry drove in earlier seasons.
When the mechanic throws the golf bag at the mail truck, it smashes the windshield to the far right as you face the truck. Later, the broken part is on the left and in one long shot, it isn't smashed at all.
When George goes to the payroll department as part of his special project he identifies himself as assistant to the travelling secretary which is the role he was hired for in The Opposite (1994) however earlier this season in The Wink (1995) he was promoted into Mr Morgan's role after inadvertently causing that character to be fired & would likely have taken on a new title in fact Jerry mentions at the start of The Hot Tub (1995) about the new promotion being a lot more work.
When Jerry and Elaine go to see the car in the warehouse, the detective refers to the angle on the V6 and the turbocharger. When Jerry concludes that the car can't be his, a distressed woman identifies it as her Saab 9000 Turbo. Neither the Saab 900 or 9000 were ever available with a turbocharged V6 engine. While Jerry would claim that his model is a Saab 900S, the Saab convertible that Kramer is seen following is a 900SE, a higher up model.
When Newman and Kramer are driving the mail truck it is left side driven. the post office uses right side trucks for their mail trucks to put the driver up next to the curb when delivering the mail.
Newman states that Mother's Day is the busiest card day for the postal service. It is actually third, behind Christmas and Valentine's Days.
The USPS eagle symbol on the mail truck is facing to the left. the postal services eagle faces to the right.
An employer would have no legal standing whatsoever to have an employee committed to a mental health facility like Steinbrenner did to George.
Tony throws the golf bag at the truck, the truck runs over a golf club, the truck begins to sway. From the wide shot you can see that there is a stunt double behind the wheel in place of Kramer and is wearing a different colored jacket and shirt as well.
George (Jason Alexander) gets the lyrics to the Petula Clark song wrong. He says "... where the neon lights are pretty", but the line is actually, "Where the neon SIGNS are pretty"
The soda can the woman puts down has the label 'Diet Soda' but the red & blue Pepsi logo has been left untouched.
Detective spoke about angle of V6 engine in car under cover, then about the turbo. Saab (both 900 and 9000) does not have a V-6 turbo engines, they are inline-4 (L4). The V6's are naturally aspirated. Later, owner says it is turbo 9000, so it is definitely not V6, but L4 engine. Also it is hard to believe what it has a clutch, since there are no clutch in hydraulic automatic transmission and automatic is most common option for US-model SAAB 9000.
Returning from the auction, Jerry pulls up in front of Elaine's house (wide shot), the hood of the car is closed. Jerry shuts off the car, removes his seat belt, but Elaine tells him that she'll retrieve the golf clubs from him later. When Jerry reengages his seat belt and starts his car which immediately begins to smoke, Jerry's seat belt is mysteriously off and the hood of the car is open although Jerry is never seen unbuckling the seat belt nor unlocking the car's hood.
Kramer chases Jerry's mechanic on the Pasadena Freeway in South Pasadena, California, and not in Ohio.
The best route from New York City to Michigan for Kramer and Newman's budget would have taken them across I-80, and through the northern part of Ohio-or something near that route. However, the second time Kramer calls Jerry he mentions that the guy they're following is "going south on 135", which Newman objects to since they're headed north to Michigan. The closest Highway 135 in that region is SR 135 near Lynchburg, Ohio, which would have already put them well out of their way.
It's difficult to believe that a postal worker like Newman wouldn't recognize Michigan's state abbreviation.
Kramer is seen opening up bottles of Mello Yello for Newman to drink so they can get the bottle deposit. The soda would cost much more than the deposit, and as such makes no sense.
If the mail had been as heavy as mentioned, Newman and Kramer would be driving an 18 wheeler, not a small postal van.
When Newman was running away the actress playing farmer's daughter accidentally yelled "Goodbye, Norman!" The producers thought this flubbed line was funny and kept the line in.
Jerry claims that when Kramer and Newman put their groceries under the hood of his car, that "The Triple A guy said I was this close to sucking a muffin down the carburetor". However, Saab 900s are fuel injected.