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Continuity
When Kramer drives the fire truck, his right foot goes from sticking out to tucked in between shots.
When Kramer is visiting the fire house, the overhead PA identifies the fire company as "Engine Company 390." In subsequent scenes of firemen set on the fire truck, their helmets identify them as Company 80.
When Jerry and Kramer watch the fire on the news, Jerry says, "of course." It cuts away right after "course," and Jerry's mouth is suddenly almost closed. Shortly after, Kramer goes from standing shoulder-to-shoulder with Jerry to a ninety-degree angle between shots.
When Kramer drives the fire truck, his right foot goes from sticking out to tucked in between shots.
When Peterman's mother's home is first shown, both ground floor windows have lights strung and lit. When the exterior is shown in the daytime, only one window has lights.
Emergency scanners just pick up the conversations with the operators, not communications between radios. That frequency is a closed frequency and illegal to listen to.
The show depicts Kramer rear steering a non-articulating NYFD ladder truck; such a vehicle does not have rear steering.
Kramer says "Nestle's Quik" when the brand name in the United States was then "Nestle Quik."
After J. Peterman's mother dies, her eyelid flutters.
They allowed the "Friedrich" name to be displayed on the box that Leapin Larry was carrying from his store. However, in The Parking Garage (1991), the show covered up the same on the box that Kramer was carrying.
When Kramer hits his head on the back of the fire truck, the sound of his head hitting is nowhere close to the actual impact itself.
Peterman answers the car phone the wrong way (it's backwards).