For Ellen Bergman's home, the production team found an exterior in California that was a believable fit for Florida, then built interiors to match that façade.
A former Toyota facility in Torrance, California, was chosen to represent the exterior the "Homecoming" lobby. The style of the architecture, as well as the nearby palm trees, made it feel like Florida, where the story is set.
The location manager on "Homecoming" found a barge in Long Beach, and the production team turned it into Fat Morgan's diner, adding custom-built neon signs for it.
The music towards the end of S1E7 (Test) was from the original soundtrack of John Carpenter's "The Thing."
One of the biggest challenges of producing Homecoming was passing California locations off as Florida. This meant keeping various Hollywood landmarks and structures off camera, along with L.A.'s distinctive heavy traffic.