Goofs

The brief first exterior shot of Mario's Pizza actually shows a store front with a different name, "Five Roses Pizza". Near the end of the episode a different exterior is shown, and this time the store front is completely different and does display the correct name, "Mario's Pizza".

When the boy is playing Frogger, the high score at the top of the game console is 7,190, the boy's score from his just-finished game. A few seconds later, the high score at the top of the game console is 860,630 (George's ten year old score).

The store across the street from the pizza shop is first a florist shop, then a few seconds later, it is a cleaners.

The guy whose last day was celebrated was at Elaine's return party 2 days later.

The outside of the pizza place shows windows. When George and Jerry enter, there are no windows.

The Frogger machine scores reset once power is lost. George (Jason Alexander) got the high score on Frogger while in high school. George and Jerry (Jerry Seinfeld) both attended John F. Kennedy High School, class of 1971. However, there was a city-wide blackout on July 13-14, 1977, at which time George's Frogger score would have been erased.

George's initials couldn't have remained as the high score on the Frogger machine in "The Frogger" because arcade Frogger machines didn't store initials with high scores.

To get Frogger hooked up to battery power they would need to unplug the machine first. An alternative approach exists in which the machine could have been opened up while still plugged in. There is internal circuitry (a bridge rectifier) that converts AC to DC. Tapping in with the battery just beyond that point would make backup DC power available so that the AC power cord could then be safely unplugged.

The antique cake slice should have been nearly rock hard after all that time. Even if it remained frozen for 200 years it would still dry out and harden.

Kramer claims that his caution tape is official police crime scene tape, but the tape he has is merely caution tape, available at any home supplies outlet. Official police tape says "CRIME SCENE DO NOT CROSS".

The outside shot of Mario's Pizza says Five Roses Pizza.

The Frogger Machine's high score are out of sequence and duplicated.

In the first scene at Mario's Pizza, when George and Jerry enter, the backdrop of the New York shops is reversed. The store name in the background is obviously backwards.

George orders two grape sodas. The soda dispenser offers only Pepsi, Mug root beer, regular Slice, orange slice and diet Pepsi. They are served their drinks in paper cups, not cans.

At 2:40 Jerry and George enter Mario's Pizza and in the wide shot as they stand in the doorway the business across the street behind them is a florist. When the camera is close up the business across the street is now a cleaners and the text on the sign is backwards.

Since the actual piece of the cake from King Henry VIII and Wallis Simpson's wedding Peterman claims to have purchased wouldn't have been edible for human consumption, it is possible he actually purchased a fresh piece of the cake that was replicated to resemble the antique one on order to take advantage of Elaine's naivete by tricking her into believing she ate the historic piece. This would explain why she never got sick after eating it, nor why he never terminated her employment, despite catching her in the act on camera.

When Kramer and Elaine are at the counter at Monk's, the view through the front window is an obvious painting.

George greets the employee at Mario's Pizza as "Mario". However, the character's name is listed as "Sal" in the closing credits.

Regarding the "correction" on the power outage of 1977 wiping out the high score: Frogger wasn't invented until 1981, so this cannot be true.

A large truck bears down on George while he's pushing the Frogger machine. Although we repeatedly hear the truck's horn sounding, the drivers hands never leave the steering wheel.

Jerry comments that Mario's Pizza was his and George's high school hangout. The pizza shop is in the city and Jerry and George went to high school on Long Island.

George (Jason Alexander) says his high score he achieved in high school was 10 years ago. The Andrea Doria (1996) reveals George to be 34, which would mean he was 24 when in high school.

Jerry brings a baseball bat to Lisi's place. Yet, when he leaves after dark, in fear of the lopper, he doesn't take the bat with him.

When Elaine (Julia Louis-Dreyfus) is on the phone to Jerry (Jerry Seinfeld) in her office, people singing "Happy Birthday" can be heard in the background. Moments later Peterman (John O'Hurley) says it was a "get well" party.

When Kramer's guys are playing Frogger on the machine that they are moving, they check the battery and calculate that they have three minutes before it dies. If they were able to power an AC-powered Frogger machine with a DC battery, they almost certainly would've known that they could've extended that time significantly by turning off nonessential components (especially the power-hungry cathode ray tube display, which is only necessary when the game is actually being played) rather than having to plug the Frogger machine in. This would reduce the machine's power and slow the drain on the battery.