Near the end of the episode, Joe and Cameron pull up to the hotel in a taxi. The taxi has a third brake light in the center of the rear window. These did not exist in 1983, they first appeared in 1986.
Palo Alto City Hall is at 250 Hamilton Ave, not 350. The location shown is very different from the real Palo Alto City Hall's location: in the episode, it appears to be at the end of a long road surrounded by a lawn on both sides, and the entrance is more or less at street level. In the 1990s (and to this day), Palo Alto City Hall's entrance is atop an underground parking structure, making it one story above street level, and the surface is a mostly concrete park space with some landscaping, trees and benches (not a grass lawn).