The shocking conclusion to "Resurrection" probably caught most viewers off guard, but at the very beginning of the story, the movie lays the groundwork for its eventual departure from total realism. There's a brief moment between Margaret and Abbie that feels ominous but a little out of place on first watch, but that comes into focus when the movie wraps up.
Early in the movie, Abbie tells Margaret that she's found a human tooth in her bag. Margaret's confused, and the sudden appearance of a tooth seems impossible, but Abbie still has it and shows it to her mom. With no clear explanation of how it got there, the two of them shrug off the bizarre event, and they never talk about the tooth again.
In retrospect, that small moment sets the stage for Benjamin's appearance at the end of the movie. The tooth establishes that strange, impossible things can happen in this world, but even more importantly, it sets a baseline for how other people will respond to those things. The movie never gets into the logic of how teeth might appear in strange places or babies might exist inside other people for decades, but it sets the tone early on and lets these horrifying, miraculous occurrences find their thematic place in the story.
