I can't remember whether this was in the movie or one of the episodes, but the scenes depict much of Earth's cultural diversity and architecture without ever naming the planet they were set in. Anyone could easily assume it's Earth, but those familiar enough with the series to know that Earth is canonically not habitable enough for repopulation or reconstruction would question "What planet is this?"
I can't remember whether this was in the movie or one of the episodes, but the scenes depict much of Earth's cultural diversity and architecture without ever naming the planet they were set in. Anyone could easily assume it's Earth, but those familiar enough with the series to know that Earth is canonically not habitable enough for repopulation or reconstruction would question "What planet is this?"