My understanding is that the style and aesthetic of the show is going to change with each episode.
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The first episode was a 50s sitcom, both in terms of visual style (the clothes they wear, the design of their house) and in terms of the plot/dialogue. "Very Important Dinner Party for the Boss" being a typical plotline for an I Love Lucy era sitcom.

The switch to color at the end of the 2nd episode is because color TV started being a thing in the 60s, with the 60s informing the visual and narrative style of the second episode.

Presumably the 3rd episode will be a sitcom from the 70s, the 4th the 80s, the 5th the 90s, and the 6th the 2000s.