1. A mixture of 1% phenolphthalein and 99% ethanol was used to paint the invisible stripe on each cast member's flag during the riddle. Once sprayed with window cleaner ("benzene"), the stripe turns magenta.
2. Production started shooting this episode at 7pm and didn't finish until 3pm the next day.
3. 100% cotton fabric is the most fire-resistant material. Cast and victim/stunt double's pajamas needed to be 100% cotton since they were encountering fire. But because the victim had to have a completely different set of PJs from the rest of cast -- down to color, pattern AND fabric, all very important evidence in the morgue -- we went with 100% cotton for cast pajamas and 100% cotton flannel for the victim/stunt double. Yes, you could feel and see the difference, but they were both 100% cotton and were able to protect our cast and stunt person.
4. The stunt person had to wear several layers of protective clothing, including the fire-resistant material asbestos underneath her pajamas. She also wore special gloves and was coated in specially prepared flammable gel.
5. The stripe on the flag was originally written to appear in red. During SFX testing, production learned that it would only turn magenta and had to rewrite the scene accordingly.
6. This challenge had two folds: 1) To achieve the doorknob shock effect -- the doorknob was rigged with a SFX person hiding on the other side. They used a sparkplug coil from a 1932 Ford Model 'T' found on EBay and 45k volts was delivered at 600 milliamperes. 2) To create the fire that sends the door tapestry up in flames, flash paper was used. A lacquer spray paint was needed to paint the magenta stripe onto the flash paper so that it would match the magenta stripe on the contestant's flag. From behind the door, the SFX person had to also light a match to set the flash paper off.
7. The best way to light a pig's head (or any dish) on fire? Bacardi 151.
8. St. Agatha is also the patron saint for breast cancer patients.
9. In the morgue, Dontae was shivering because his pajamas were still damp. A team of producers helped to keep him warm with hair dryers.
10. No real benzene was used on set. Instead, the benzene bottle was filled up with ammonia, which reacted to what was painted in clear color on the flag -- turning it magenta.