It could mean he secretly introduced something (like an idea or a small object) into the stories about your wife. Maybe he added a false detail or a new element without permission.
First, you should find out exactly what 'it' is. If it's something inappropriate or false, you can calmly correct the person and set the record straight.
Well, perhaps it refers to an object or an event. Say, a small memory or an item that unexpectedly found its way into the story about his wife while he was telling it. It might be something like a little joke that he didn't plan on saying but just came out as part of the story.
That's an odd situation. Maybe you were in a hurry and the clock was in your hand while you were near her backpack, and it accidentally slipped inside. It could have been a small alarm clock or a pocket watch.
I'm not entirely sure what you mean by 'cooking slipped in her casserole'. It could be a very unique or accidental situation. Maybe you were trying to transfer some cooked ingredients into the casserole dish and it accidentally slipped in an unexpected way.
For instance, he was recounting a story of their vacation. He was focused on how his wife loved the beach. But then, accidentally, he slipped in that she got a little scared when she saw a big crab. So, the incident of her getting scared by the crab was the 'it' that found its way into the story about his wife.
First, make sure your neighbor is okay physically. Then, depending on what your wife's story is about, you might need to clarify things. If it's a misunderstanding, calmly explain the real situation to your neighbor.
Your wife can quickly go and assist the neighbor to stand up. Then you two can check if the neighbor has any bruises or cuts. If so, you can get a first - aid kit to clean and dress the wounds.
Well, if the neighbor slipped, immediately assess the situation. If it's serious, call for medical help. As for your wife, she could be a great source of comfort. She can talk to the neighbor in a soothing way, perhaps share some of her own experiences with minor accidents to make the neighbor feel less embarrassed. And of course, your wife can also help you in making the area safer so that no one else slips in the future.
Without more context, it's impossible to say exactly who 'he' is. It could be a friend, a relative, or even a co - worker who had an impact on the stories about the wife.