A large stopped clock (at teatime roughly 4pm) the Mad Hatter was being punished for "killing time" so that is why it was always teatime.
A large tiered cake/sweets server with decaying sweets. Bugs, cobwebs etc...
Mismatched chairs and serving wear.
Dormouse, check. If you could find a large teapot to have him inside, that would be funny as well.
The March hare was also present.
Poetry scattered about on aged paper. (they quoted many different ones - "Twinkle, Twinkle Little Bat" would be appropriate if you make them where you can read them.
Playing cards - scattered across the surface of the table.
Large pots and jars containing "treacle" and jam and butter and such.