In this episode Walt said that his 'true love' was Beatrice Anderson, who lost all her hair to a disease called Alopecia. In real life, Barry Corbin (Maurice Minnifield) was diagnosed with Alopecia.
In the episode "Three Doctors" 8 months earlier Ed tells Leonard he can't stand the sight of blood and Leonard told him he would get used to it. I guess Leonard was right, he got used to it; otherwise he wouldn't be able to look at all the units of blood they collected for the drive so easily.
Goof: Chris says the cerebellum could conceivably be affected by electromagnetic activity, thus explaining the dream-switching. All scientific questions aside, he has the wrong part of the brain. The cerebrum controls things like thought, memory, and dreaming; the cerebellum controls things like balance and muscle coordination.
Goof: When Shelly and Holling wake up, it is light out, but this close to winter the sun would be rising much later.
Factual error: Joel states that things fall at a speed of "32 feet per second squared." However, this is actually the rate at which gravity causes things to accelerate. Acceleration is the rate of change of velocity; speed is the absolute value of velocity. Since he memorized the number and is apparently very familiar with physics, it's unlikely Joel would be unaware of the difference.
Marylin states that she had read the "entire" Nancy Drew series. Considering new titles to the series were still being added to the original run of Nancy Drew books at the time of this episode's airing and ten years beyond that, her claim is doubtful.
Obviously, the writers did not do their Nancy Drew research.
Maggie: Did you ever read Nancy Drew?
Ruth-Anne: Thanks for the compliment, Maggie, but she was a little after my time.
Nancy Drew first appeared with "The Secret in the Old Clock" in 1930
The actress playing Ruth-Anne would have been twelve years old at the time, the target age for the Nancy Drew series, which was not only the most popular girls' series at the time, but the most popular juvenile series ever up to that date. The books were most certainly "during her time"
Goof: Joel insists he can't breach doctor-patient confidentiality and tell Maggie what's wrong with the owner of the curio shop. However, when Mike moved to town he had no problem telling her he had MCS, explaining his symptoms, and publicly expressing his professional opinion about them!