Abigail's daughter, Sammy Jo, is biologically Sam's daughter. Evidenced by the fact that she has inherited Sam's genius with an IQ of 194 and a photographic memory, she works for Project Quantum Leap in the future.
When Sam is looking at Abigail's telephone bill, the address for the phone company reads "Baton Rough", instead of "Baton Rouge". The phone company's zip code is listed as 71839, which is the actual zip code for Garland City, Arkansas.
Kimberly Cullum, who plays Sammy-Jo Fuller, also plays young Abigail in One Little Heart, the first episode of the Abigail Fuller trilogy.
When Sam stands outside and talks to Marie on the front porch, the reflection in the glass in the door is of Sam, not Larry Stanton.
This is most noticeable when Sam sends Stanton's wife back into the house to make lemonade.
Parley Baer, who plays Judge Shiner, also appeared in the Season Three episode "8 1/2 Months" as Dr. Rogers.
When Mrs. Stanton tries to seduce Sam, she says she's going to be "like Jane Fonda in Butterfield 8." Elizabeth Taylor starred in Butterfield 8; Jane Fonda starred in Klute.
Cherlyn Stanton: Hello, Sweet Cheeks! Come on over here, you hot-blooded Southern rebel and melt me down! Tonight, Lawrence Stanton III, I am Jane Fonda in Butterfield 8!
Al: Ziggy hasn't the slightest idea why you're here. I suggest you open the door and see what drifts in.
[Al has just told Sam that his daughter, Sammie Jo, works at Project Quantum Leap in the present]
Sam: Does she know that I'm her father?
Al: No. And Ziggy says after this leap you won't know either.
Sam: I'll know, Al. I'll always know.
Al: Don't look at me, I don't make up these assignments!
This episode originally aired along with "Trilogy, Part Two" as a two-hour special.
Sam and Sammy-Jo discuss their favorite parts in Brigadoon.
Brigadoon is a musical about a mysterious village in Scotland, which appears for only one day every hundred years. Two American tourists accidentally stumble upon the village just as a wedding is about to take place and change history as one of them falls in love with the bride. Trouble springs, however, when it is revealed that no one is able to leave Brigadoon, causing the man to leave his new love behind to return to the present.
At the story's end, the man goes back to Brigadoon to reunite with his love.
This plot is highly reminiscent of Sam's quest with Abigail.
Sam, in essence, "goes back" to Abigail in "Trilogy, Part Three" after falling in love with her and being forced to leave her behind in "Trilogy, Part Two."
Sam, unlike the musical's protagonist, is unable to stay a second time.
When Sammy-Jo watches the trial, she does so crouched down secretly in the balcony.
This is reminiscent of the novel To Kill a Mockingbird, in which the main character's daughter watches her father in trial as a defense attorney.
In both To Kill a Mockingbird and The Last Door episode, the defense attorney is defending an innocent person accused of murder in a town biased against them.
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