Nurse Heather's four year old son, Jack, likes to put his fingers in his mouth. But this can lead to dental problems in the future. She heard the episode about Matt learning to keep track of his keys, by noticing that he was setting them down and saying "I'm putting my keys on the counter." Heather wondered whether it could help her son.
We also discover that Heather has bigger plans, involving her husband, and this was just a practice run.
These last two episodes explore "noticing and labeling." There's been a lot of recent psychological research on these techniques.