In the pilot, the twins are referred to as Matthew and Gregory. However, in further series, they are referred to as Michael and Geoffrey.
Ray is sitting on the bed and has unlaced and removed both of his boots (the sound of the second boot can be heard hitting the floor), but yet when the camera returns to him from Deborah he is still unlacing one of his boots.
In the beginning the twins' food bowls flip off their highchairs without being touched. A crew member pulled them off using fishing line.
In several shots when Ray is arguing about the fruit with his parents in their kitchen, you can see the mic move up and down.
When Raymond tells his parents that there will be no party, a microphone is visible on the top of the screen.