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The concept of Hopper having to learn how to be a father to two sons after having two daughters.

The concept of Will telling his college friends that he's a twin, and showing them pictures of Jane, forever frozen at 16, and them telling him they see the resemblance.

The concept of Jonathan getting Will back, but still mourning a younger sibling in the end.

The concept of the Hopper-Byers family never getting to live all together under one roof.

The concept of Will’s college friends joking about how everyone in Will’s family has a name starting with J except for him, and him having to resist saying that his sister also had another name that sounded similar to his own.

The concept of Hopper seeing Will huddled asleep in Jane's old room one night and just seeing Jane for a second.

The concept of Jonathan making a film about overcoming abuse and dedicating it to Jane.