Ricky has two chickens in the pressure cooker and then it explodes. He and Fred pick up the chickens from the floor and take them over to the sink to wash them off. If the chickens had been in the pressure cooker for any length of time, they would have been hot to the touch but he and Fred handled them with no sign or mention of their hands being burned.
When Lucy and Ricky are eating breakfast in the kitchen, Ricky points the toaster at Lucy as the bread pops up and she catches it. The lever on the side of the toaster doesn't pop up and he is holding the toaster by the metal sides - if the toaster was really on, he would have burned his hands.