In a throwaway gag, Harry claims that the Chrysler Building is heavier than the Great Pyramid at Cheops.
In reality, the Great Pyramid is significantly heavier.
In 1985 nor 1986 was the name Mel used or an option for a hurricane. To date the name Mel has never been used. The closest was 2019 Melissa.
When Chad decides to video tape the birth, starting at Harry's bench, the lens cap is still on the camera. This is likely due to prevent a reflection and flare if the glass lens was exposed. As is, the glass cover to Harry's watch caused a moderately significant flare in similar position a recent episode.
Miss Collins is clearly wearing a full pillow under her shirt to simulate her pregnancy. A woman's pregnancy does go any higher than just below her breasts, yet the pillow is clearly blocking hers.