Shot entirely in Romania.
The title changed to "Seven Sisters" during post-production but when Netflix bought the film, it was changed back to "What Happened to Monday", its original title.
Filmed in 94 days.
Netflix bought the streaming rights to the film for the United States and other markets.
The adult sisters can be distinguished by their hair styles: Sunday - pony tail, Monday - long wavy hair, Tuesday - red head, Wednesday - mid-length hair, Thursday - short hair, Friday - knit hat, Saturday - platinum blonde.
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