And of course decorations that indicate allegiance to:
Nazis (WWII pulp)
The Kaiser (WWI pulp)
U.S.S.R. (1950s pulpish)
Czarist Russia (Victorian age through WWI)
You know, the bad guys.
Transomed doors!
Ceiling fans.
Old fashioned radio equipment. (As an aside, some of the really old radio transmitters grounded through the operator, leading to the nickname 'Sparky'
I used one of those sets once. The experience was... not pleasant. And the design was deliberate, it was actually supposed to do that! 
)
Some items are already in the works - the Pool Hall might fit right in.
The Auld Grump
