During rehearsal for the armored-truck robbery scene, a jeep carrying a camera crane was driving up a hill ahead of the truck when the jeep's brakes failed. It started rolling back down the hill, slammed into something at the bottom of the hill and the driver was thrown out of the vehicle. He died in the hospital a few days later.
This episode is a double tribute to the movie White Heat, because there is a tank truck, as in White Heat, and also because a character imitates Jimmy Cagney, precisely in a major sequence of White Heat.