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While it hasn’t stopped people from enjoying the film, a decades-long argument over a plot hole in Back to the Future resurfaced recently, with Marvel filmmaker James Gunn and his Guardians of the Galaxy star Chris Pratt leading the charge.

After the “5 Perfect Movies” social media challenge was trending this week, Gunn reignited an old debate that has plagued the 1985 sci-fi classic, which is namely: Why don’t Marty McFly’s parents, George and Lorraine, remember Marty?

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After he zips back in time in Dr. Emmett Brown’s tricked-out DeLorean, Marty — going by the name Calvin Klein — is forced to play matchmaker after he inadvertently alters the timeline of how his parents first met.

Fans have long debated why George and Lorraine never noticed a similarity between their son Marty and the boy Calvin they first were introduced to in 1955.

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Gunn argued on Twitter that a “perfect film is something that sings from start to finish with no obvious mistakes, whether they be aesthetic or structural. There are no logical lapses.”