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Continuity mistake: At the family meal (minus Loretta), Loretta's father asks for the wine. When Rita passes it to Cosmo his left hand reaches into the shot to take the carafe, but when the shot changes he is shown receiving it in his right hand, and Rita's grasp changes as well. (00:41:00)
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