Which flat is this?
Those with a keen eye for detail would note that Monica’s apartment number was sometimes different. It altered somewhere between seasons. Earlier episodes, as seen above, had the apartment door showing Apartment 5. This was eventually modified to 20.
While we don’t know why this unique alteration occurred, it was required. The view from Monica’s balcony suggests a high-rise apartment, which would have been absent from apartment number 5. Apartment 20 appears to be more suited for that perspective.
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