Question: When Grandpa is walking his dogs, you can hear a boy say, "Keep your dogs off my lawn," then laughs. You hear his laugh again in the beauty salon. What was that about?
Answer: I tried to find a clip of these scenes but didn't find exactly what you're referring to. If it was the exact same laugh that was heard, it may be a sound effect added to the film during the post-production editing. Foley artists add all types of sound effects to movies, including laughs, groans, coughs, etc. Sometimes one particular sound gets used more than once. One famous example of a repeated sound is the "Wilhelm" scream. This particular scream has become a tradition that many editors add to movies.
Answer: The laugh does seem out of place because it sounds more like kids than the ladies at the salon. But it didn't sound like the same laugh to me. But it does sound like the same person recorded both laughs. It also seems like the kid's line was added after filming the shot. So it wouldn't surprise me if an adult (perhaps one of the production sound mixers) recorded a couple different lines and laughs in a pretend kid's voice. Then one of those laughs was added.
Bishop73