- Twin brother is Ross Duffer.
- Matt Duffer & Ross Duffer were nominated for the 2018 Emmy Award in the Outstanding Directing For A Drama Series category for Chapter Nine: The Gate (2017), but lost to Stephen Daldry for Paterfamilias (2017).
- Matt Duffer & Ross Duffer were nominated for the 2018 Emmy Award in the Outstanding Writing for a Drama Series category for Chapter Nine: The Gate (2017), but lost to Joel Fields & Joseph Weisberg for START (2018).
- Graduated from Chapman University.
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