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.
Continuity mistake: Ray offers to rub Debra's feet instead of doing another chore. He takes her black socks off and throws them on the floor, under the table. The socks can be seen for a few shots, in the same spot, after Robert comes in. At one point, however, one of Debra's black socks can be seen on the couch in the middle, and in the next shot, the sock has been removed.
Revealing mistake: When Raymond runs out of The Shower at the beginning of the episode, you can see that he's wearing nude colored shorts.
Continuity mistake: Ray says "This has to be woman's work" at the start and is holding the papers in his right hand. Camera cuts and now he's holding them in 2 hands and they are neater. (00:02:30)
Visible crew/equipment: Ray accuses Robert of making up the scores and walks over to him. When he does part of the set lighting is in shot. (00:21:10)
Other mistake: At the end in the kitchen there are a few camera angles that features a black object hanging into shot. This item moves perfectly with the camera and so is not part of the set or a boom mic. Perhaps something was dangling in front of the lens during filming. (00:20:45)
Visible crew/equipment: Robert walks in the back door and a stage light is visible in the top right hand corner. (00:20:20)
Visible crew/equipment: At the end, Debra walks into the kitchen and is followed by a boom mic. (00:18:40)
Continuity mistake: The amount of ice-cream on Ray's spoon on the sofa increases dramatically between shots. (00:13:10)
Continuity mistake: When Robert is leaving Ray's house, Ray is stood next to Debra. When the camera changes he is much further away. (00:09:55)
Continuity mistake: Just before Robert leaves he gives Ray and Debra the results. Debra has her hands clasped in front of her. Camera changes and they are on her hips. (00:10:00)
Visible crew/equipment: Frank goes off on a rant about tests dealing with "book smarts." When he does a boom mic briefly drops into view. (00:07:50)
Visible crew/equipment: Ray asks Debra how bad is it, and a boom mic drops into sight. (00:05:30)
Continuity mistake: At the start, Ray's sleeve is constantly altering between raised and lowered when looking at the bits of paper. (00:02:10)
Revealing mistake: When Ray runs out of The Shower at the start you can see the boxers he's wearing. (00:00:50)
Answer: War.
By whom?
Edwin Starr.