Continuity mistake: When Robert is in Debra and Ray's kitchen, as they talk Debra holds a plate with a slice of meatloaf on it. When she finally places the plate on the table, the piece of meatloaf Ray eats is different.
Continuity mistake: Prior to bringing Ray up for the role-playing exercise, the parenting teacher erases a circled phrase from the chalkboard. Throughout the scene, the chalked circle flips several several times between being totally erased and having a faint outline left over.
The Sister - S4-E6
Continuity mistake: Marie comes over with a cake shaped like a cross. In almost all the scenes where the family is sitting at the table different pieces of cake are missing. In some of the camera angles there are no pieces of cake cut from the bottom yet when the cake is seen from other angles there are.
Continuity mistake: The large spoon and fork in Frank and Marie's kitchen change positions, right to left, and up and down. In some episodes the fork is on the right, and in others it is on the left. In other episodes, the fork is higher or lower than the spoon. At other times, the spoon and fork seem to be larger than at other times. It is obvious when she removes one of the utensils that they have never been moved - The Wallpaper underneath is a different shade from fading. If these were moved at subsequent times in the supposed feud, the difference in wallpaper fading would be seen.
Other mistake: The kitchen in Marie's and Frank's house is completely reversed in this episode than in the rest of the series.
Separation - S5-E23
Continuity mistake: In the scene where Debra tells Ray her parents have separated and he laughs, later on in this scene he tells Debra that he got free candy from the broken vending machine at work. When Debra leaves the room, Ray starts taking more candies out his pockets and throwing them on the bed. Take notice of the position of the sweets on the bed. Now just after the close up scene of Ray scratching his head, look at the position of the sweets. Totally different. One or two are actually closer to the end of the bed, whereas in the scene before, they were more further on. (00:52:50 - 00:53:55)
Continuity mistake: Amy's brother was called Russel. In later episodes he is called Peter.
Older Women - S6-E9
Visible crew/equipment: Someone appears behind the kitchen door, when Ray goes, "and I can see how that can make you all... Man-hatey...", and hangs around behind the door for several seconds. (00:15:55)
Revealing mistake: At the end, as Ray's parents walk out the back door, Robert says "extra credit". Look out the door when he says this, and you can see the house in the distance wave as if it were a painting.
Frank Paints the House - S5-E24
Continuity mistake: Inside the kitchen, the back door is perpendicular to the sink's wall. On the outside, the door is part of one continuous wall.
Deliberate mistake: In this episode, Ray tells Amy's mother that Debra no longer reads his column, although she did when they were dating "and she was wooing me." But in an earlier episode, Ray proposed to Debra in his very first column - so when they were dating, he didn't have a column.
I Love You - S1-E2
Continuity mistake: During the bathroom scene in this episode, two wall tiles immediately below The Shower head keep appearing and disappearing between shots. (00:10:55)
Continuity mistake: When Ray is yelling at the kids for throwing his golf clubs down the stairs, two stuffed animals fall down from the shelf. After Ray is done lecturing the kids, you can see the animals are back on the shelf when it shows Raymond talking to Debra.
Continuity mistake: In this episode, Frank celebrates his 65th birthday but in "Debra Makes Something Good" he says he is 64 years old.
I Love You - S1-E2
Continuity mistake: Towards the end of the episode, Robert comes into the kitchen and shuts the door. As everyone is saying "I Love You" the door is closed, then when Robert hugs Ray it is open, then closed again. (00:16:00)
Visible crew/equipment: Robert pushes Ray into accepting his offer to go on a citizen's ride-along. They are initially sitting on the couch at the time, and when they rise, if you look closely behind where Ray is standing, through one of the kitchen windows you can spot a production crew member.
I Love You - S1-E2
Continuity mistake: During Ray and Frank's discussion on saying "I Love You" in the bathroom, the grout design on the wall and the towels in the closet behind Frank change back and forth.
Factual error: Robert begins as a SGT in the NYPD (later promoted to LT). However, he has issued speeding tickets in his brother's/parent's neighborhood. The family Barone lives in Lynbrook NY. Lynbrook is part of Nassau County, Long Island, which is not part of NYC. Robert would have no jurisdiction to issue speeding tickets there.
Other mistake: When Ally comes Home from School, and opens the door, there is brown carpet outside where grass should be.
Answer: War.
By whom?
Edwin Starr.