Continuity mistake: During the scene with Ray and Frank playing Ping Pong, in shots showing Frank's face, his hair is pointing out, but shots from behind him show his hair is back down.
Continuity mistake: In the last scene where everybody is in Ray's living room, the strap on Georgia Engel's purse keeps changing positions from hanging from her left shoulder to across her chest. Finally, when both her hands are occupied trying to light a match, her purse slips from her shoulder to her bent elbow. In the next shot, her hands are still not free, but the purse strap is on her shoulder again.
Continuity mistake: At the beginning of the ceremony, Kevin is seen between Robert and Bernie and is all spiffy but when Debra is walking up the aisle with Warren, you see Kevin looking normal with a tux behind Lois and, then, a moment later, he is all spiffy again between Robert and Bernie.
Plot hole: The bedroom scene finds Robert sitting up in bed after getting home from the hospital with his upper thigh injury. If he really had a wound in that spot, there's no way he could sit like that.
Visible crew/equipment: At the beginning of the episode, when Raymond starts to leave the bedroom, you can see a microphone boom at the top of the screen. (00:00:40)
Continuity mistake: During his discipline fiasco Ray sends the twins, Michael and Geoffrey, to their beds at noon. Depending on the camera angle, one twin (who lies closest to the camera) has his head atop his pillow at the middle of the bed, and in other shots that pillow is much further back near the headboard and the boy's head lies on the blanket.
Character mistake: Debra says The Car broke down when it was pouring rain, but all the exterior shots show snow on the ground.
Revealing mistake: In the scene when Debra is yelling at Ray, Ray falls back onto the couch and then onto the floor. You can see a small gymnastics cushion on the floor to cushion his fall.
Other mistake: When Amy runs out of the basement wearing Robert's pants, the pants are at full length, with the belt under her arms and the bottom of the pant legs at her ankles. When she is standing next to Robert, though, it is clear that he would have to pull the pants all the way up to his ribs for the legs to be the right length on him. Also, the pants are unzipped and the zipper pull is hanging just below Amy's breasts. Since a pants zipper is usually just an inch or so above the crotch, Amy would not be able to pull the pants that high unless there was a 12" drop between the zipper and the crotch of the pants.
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: Ray puts the snacks in a blue bag. But when they get to the field, the snacks are in a different bag.
Factual error: Robert, as a police officer in NY State, is bound by law to carry his weapon at all times. Robert is never seen with a firearm, not even when in uniform. A police officer would not have his sole sidearm strapped to his calf or ankle under his pant leg, making it hard to access in a situation where he would need to be able to draw it at a moment's notice.
Continuity mistake: During the scene when Ray and Frank are playing Ping Pong, you can see that the balls are on the floor, but in a few shots, they're not.
Continuity mistake: When Debra opens the door for Robert, she's holding one of the twins upright. But in the very next shot, she is holding him differently. (00:15:40)
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: At the beginning of the scene where the three Barone kids are singing along to the Hackidu song with Robert on the couch, the scene opens with a picture of the house from the outside, and it is light and not raining at all. Then, when Ray comes in minutes later, it is suddenly dark and pouring rain.
Continuity mistake: When Frank puts down the bottle of liquor, he puts it on the middle of the table. When Raymond picks it up, it is at the edge of the table.
High School - S2-E10
Continuity mistake: The milk Ray spills on the kitchen table is there in one spot, then when Marie walks in with the shorts she bought for Ray the spilt milk has vanished.
The Kicker - S6-E11
Revealing mistake: During the scene after Robert breaks the window with the football, if you look close at the broken window, you can tell that it is some sort of thin material and not glass. Around the break the "glass" is flapping in the breeze like paper. (00:12:20)
Other mistake: In the beginning of the episode the kids are playing a Nintendo 64 game. Debra comes down and turns it off by pressing a button on the controller. The only off button for a Nintendo 64 is on the console, which was on the coffee table.