Goof (continuity error): The set for the Heffernans' living room includes windows on both sides of the front door (the front door is centered between windows), but the view from outside of the front of their house shows the front door next to the right corner of the house with no window in between on that side (all of the windows are to the left of the door).
Goof (continuity error): When the outside view of the Heffernans' house is shown, there is no porch. Yet there are multiple episodes where they are on their front porch.
Goof (errors in geography): In a few episodes there is a reference to the characters going to "Dairy Queen". There are no "Dairy Queens" in Queens, or in all of NYC for that matter.
Goof (continuity error): The exterior shots of the Heffernans' house from the street shows a screen door on the front door, but when people go in and out of the house on the set, there isn't a screen door.
Goof (continuity error): In the episode where Doug brings home a snow cone machine from work, he is in the kitchen with a full snow cone, walks through the door to the living room, and it is almost gone.
Goof (continuity error): Exterior shots of the garage show four windows for each door, the interior shots show three windows.
Goof (continuity error): In the episode where Carrie boycotts Doug's favorite restaurant, Arthur receives a VHS box set on the Civil War (blue and red box). The boxed set is changed to "The Great War", World War I...different color (gold and white) and smaller package, too.
Goof (miscellaneous): In one episode Doug and Carrie's wedding is shown. Here you obviously see Carrie's wedding dress. In a later episode where Carrie has become concerned with her weight, she is shown trying to fit back into her wedding dress. They are two completely different dresses.
Goof (errors in geography): In some episodes, characters from the show are shown with paper cups from the restaurant In and Out Burger. There are no In and Out Burger restaurants in New York City.
Goof (continuity error): In the outside shots of Doug and Carrie's house the door has three small windows, however on the inside, the door has one big window.
Goof (continuity error): In one episode, Carrie and Doug talk about "their" song in the ninth grade. In another episode they indicate Doug met Carrie while he was a bouncer at a local bar.
Goof (errors in geography): In several episodes with scenes that take place outside, palm trees can be seen in the background due to the show being filmed in Los Angeles. There are no palm trees in New York City.
Goof (revealing mistake): In episode 20 of season 7, When Bernard (Hal Linden) plays the piano during Arthur's (Jerry Stiller) dinner party, you can clearly see that his hands don't touch the keys.
Goof (continuity error): The front door when shown from the street has three vertical windows slanting up from left to right, but when the front door is shown from the inside it has a single, large, rectangular, stained glass window as well as a mail slot.
Goof (continuity error): When the house is viewed from outside it shows more bedroom windows then how many are actually in the bedroom.
Goof (continuity error): When Doug is eating in the kitchen after he shaved himself, his face is full of patches to cover cuts from shaving. In the next scene, when he is driving his truck, his face is perfect with no cuts.
Goof (revealing mistake): There is a scene where Doug is cooking breakfast on a gas stove without a flame.
Goof (continuity error): When Carrie and Doug are sitting in the theater after the show talking, Carrie's shawl is on her shoulders, off, and then back on again in a matter of seconds.
Goof (crew or equipment visible): When Carrie returns to Doug after the show, you can see a microphone next to the chandelier.
Goof (errors made by characters, possibly deliberate errors by the filmmakers): Spence is eating some peanut M&M's he found in Doug's car. Spence is allergic to peanuts.
Goof (factual errors): Doug buys a new satellite dish and flips through the channels. He comes across a sports network and announces "Florida State at Purdue". As of November 1998, when this episode was originally aired, Florida State had never played an away game at Purdue either in football or in basketball.
Goof (continuity error): At the beginning, Doug and Carrie are watching T.V and "their song" comes on. Carrie mentions that it became their song during junior high. In a later episode, which flashbacks to Doug and Carrie meeting for the first time at a local nightclub, which would have to take place at the minimum age of 21.
Goof (plot holes): At the beginning of the episode Cary talks about her and Doug being together in Junior High, but in a latter episode it's showed that they meet in a disco in the 80's, when Doug was still a bouncer and living with Richie.
Goof (continuity error): Ray is introduced as a new character, but in Season 1 of Everybody Loves Raymond Kevin is a reoccurring character for 8 episodes. In the later cross over episodes Kevin James character is reintroduced as a "New" character, Doug Heffernan, on Everybody Loves Raymond.
Goof (errors in geography): In the supermarket, Doug is seen carrying a six-pack of Cheerwine. Cheerwine is not available for distribution in New York.
Goof (continuity error): The Guy puts his checkbook away when Doug refuses to take money, but it is suddenly back in his hand when Doug agrees to take it.
Goof (continuity error): When Carrie and Helen argue about the shopping cart, a dark-haired woman in a blue-and-black sweater watches. It then cuts over to Arthur, and this woman is seen passing behind him, carrying a shopping basket. When it cuts back to Carrie and Helen the woman is standing there again as if she'd never moved, and is not holding a basket.
Goof (errors in geography): Doug, Carrie and Arthur are driving a small red car Arthur bought for them on the freeway. One of the signs have the streets Fairax Ave. La Brea Ave. Crenshaw Blvd. It's interstate 10 near Downtown Los Angeles.
Goof (factual errors): The tiny car Arthur buys for Doug and Carrie has the steering-wheel on the right. However - in Luxembourg the steering-wheels are on the left.
Goof (factual errors): The car Arthur buys is a 1970 Mini 850 Mk III, not a Douchenberger from Luxembourg.