We're Gonna Be All Right - S2-E12
Factual error: When Susan has an MRI scan she walks into the scanning room with the radiographer wearing jeans and an underwire bra, both of which are not to be worn in the scanning room due to the power of the magnet which would pull her towards the scanner. She also is carrying her handbag which also would be pulled against the scanner. She is left fully clothed as she enters the scanner, wearing the under-wire bra would pin her down to the scanner. A coil must also be wrapped around the area being looked at so that images can be obtained, she did not have anywhere near her body. The radiographer also had pens in his pocket which would easily fly out and towards the scanner.
Chosen answer: Poker. They have been playing that this whole time, once a week with everyone who was invited that lived on the Lane.