One of the greatest concepts I learned in grad school came from my fluency professor. She was explaining how difficult it can be to raise a child's awareness of their own speech. Sometimes they just don't listen to themselves, and they have to listen to themselves before they can fix their errors. But before they learn to listen to themselves, they have to learn how to listen to other people's speech. Thus the concept of a "You Caught Me" chart. It works best with younger kids, like ages 3-8ish.
First, introduce the child to the chart:
"Hey, Josh/Kyle/Emily/whatever the kid's name is, sometimes I make mistakes while I'm talking too. If you catch me making a mistake, say, "I caught you!" Then we can draw a smiley face in the chart. If you catch me FOUR times, then you get a prize!"
It's usually very motivating and exciting for these kids. They kind of feel like they're the speech teacher, and what's not fun about that?!? At first they may not notice any of your errors. You might have to correct yourself for a while: "Oops. I forgot to say my /s/ sound. Let me try that again. Ssssstop." Eventually they will start to notice something is wrong, but not be able to explain it. That's ok! It's a good start. Pretty soon, they should be able to catch your errors 100% of the time and be able to explain what you did wrong 100% of the time. Now you're one step closer to having that child identify their own errors.
It's simple. It's genius, and here's one for you if you want it.
It's basic and to-the-point. Just laminate it or put it in a page protector so you can re-use it.