But, according to police documents, the detectives investigating the alleged assault did find a train set in the attic. A detailed drawing from 1992, which is shown in the episode, includes an object labeled “toy train track” in the attic crawl space.

This episode captures Ms. Farrow’s adult life, 28 years after she says her father assaulted her. It shows her husband, Sean, whom she met on a dating site linked to The Onion, and Ms. Farrow, now 35, playing with their young daughter.

At one point, Mia Farrow asks her daughter, “Do you ever feel angry at me?” referring to her choice to bring Mr. Allen into the family. In response, Dylan Farrow says that, first and foremost, she was glad that her mother believed her account of that day in 1992, saying, “You were there when it mattered.”

Another scene in the episode shows Mr. Maco, the state’s attorney, meeting with Ms. Farrow — their first encounter since 1993.

Mr. Maco said that he told Mia Farrow that when her daughter becomes an adult, he would be happy to answer any questions. That opportunity came last fall — and the documentary team recorded their conversation.

“A part of me really, really wishes that I could have done it,” Dylan Farrow tells Mr. Maco, “that I could have had my day in court.”

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