Sir Rhosis wrote:
Honestly, considering the budget, had they visited future Earth, we might have gotten a shot of New York (or other major city), overlaid with a matte painting similar to the one used for "A Taste of Armageddon." Had we met any civilians, they'd be wearing orange or red jumpsuit, or Commissioner Ferris' duds. So, my answer would be, in keeping with the look and budget of TOS, and not resembling TMP or Phase II.
They could've gone even cheaper and go the Irwin Allen Lost In Space route and portrayed 23rd century Earth like the 1960s, with little to no advancements in technology.