I’ve also heard that when the right hand itches, you’re about to either pay a bill or receive a letter. It depended on who I spoke to at the time.
No one was allowed into our front door- ever. The front door was only used to retrieve the mail. We had three doors, due to the sun room Mom had built for her orchids. The side door was for all traffic. Anyone who did not know this was not allowed into the house for any reason unless it was the police, fire, or EMT. The back door was for gardening or cleaning, though some cousins did find a way to break in when we weren’t home, once. Nothing was missing, just a note on the kitchen table saying they had come to visit. Mom was upset and accused me of teaching them to break the lock. I honestly couldn’t remember doing it, so I remained silent.
Ours was shoes on the bed. I wasn’t supposed to even put slippers up when I cleaned the floor.
We included dropping the broom as we swept or hearing the broom or vacuum fall from another room as a harbinger of a visitor.
It was also common to “buy” a wart. Give the person a penny. Some said to rub the wart with the penny to kill the germs.
Then I found out that the buyer could get the warts they bought! 
I’d heard some similar effect if one watches a pet evacuate.
I’ll have to pay attention to this one. My feet get so hot in spring and fall that I have to soak my feet in cold water just to be able to sleep. The heat of the summer doesn’t affect my feet the same way, only when the high temps for the day are in the 80’s. I do go barefoot around the house in summer, but definitely not in winter, especially not while living on the first floor. Second floor or above, I had people below me who might keep their apartments warm enough to heat my floor. Then again, they might not. Such is the chance one takes when living in low income housing. 
There was once a tale of my grandfather working with a man who had a weeping wound in his leg which would not heal. The man was a strong, huge fellow no one would mess with. He was game for trying a “new” cure, so on a Friday, coworkers tied him up, blindfolded him, and sat him near a campfire. One man then stayed behind to administer the cure. He threw a shovel full of ashes from the fire on the wound and took off running. If he hadn’t have run, the wounded man would have killed him. On Monday, the wound was healing, and the man forgave his healers. The lye from the fire’s ashes had killed the germs and started the healing process, but it hurt intensely.