When Sophia stands in front of the refrigerator it is implied she is naked under her robe, but something like a slip is seen in one shot, sticking out from under the hem of the robe.
When the plane passenger opens the door, no wind blows on the stewardess, who sits right in front of the opening.
Aside from the fact that hot cocoa doesn't make sense on a hot day, it took Rose less than a minute to make it. However, she wasn't expecting the triplets, so she had no reason to make it beforehand.
Dorothy claims that the triplets do not look alike as if they should be identical. However, even triplets can be fraternal.
Fred, the AC repairman, seems like he can't fix the air conditioner. The girls are still suffering from indoor heat days after Fred stops by to fix it or at least attempt to fix it. When the girls return from Minnesota, they seem thrilled to be home despite the fact that the house should be a sauna even if the heat wave ended during their trip.