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.
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)
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.
Continuity mistake: When Marie backs The Car into Ray and Deborah's house, the debris on The Car changes from shot to shot.
Meant to Be - S5-E4
Continuity mistake: When Robert stops Marie from calling Amy, he removes the phone from her hand and places it on the table where it rolls out of place. In the next scene, the phone is placed back where Robert put it before.
Continuity mistake: In the episode "Traffic School," Robert notes that when he was young during a family trip he was left at a gas station in New Mexico. But in "Ray's Journal," he says that he was left at a gas station in Arizona.
Revealing mistake: Marie acts like she is reading from Raymond's diary, however from the angle that she's holding it, it's obvious that there's no writing on the page except for a standard header on every page. Raymond also doesn't write anything when she asks him to amend the entry.
Continuity mistake: When the family is riding to the wedding, a bright orange sign is visible in the background. A few shots later, the same sign goes by again.
Continuity mistake: In the last scene in The Car, there were 5 of them driving to the event, then 6 driving back home.
Suggested correction: There were always 8 driving to the event and then 8 driving back.
Super Bowl - S5-E13
Factual error: Ray, Gianni, Robert and Frank are watching a football game when Ray gets the call from Newsday to cover the Friday press conference for the Super Bowl that weekend. There is a 2 week break between the AFC/NFC championship games and the Super Bowl, so there would be no NFL game on TV at the time. There would also be no NFL game on during the afternoon on a weekday.