The hand of "Thing" belonged to Ted "Lurch" Cassidy.
We learn from Wednesday that the polar bear rug is named Bruno.
Morticia and Gomez show Fester the top tier of their wedding cake. The bride and groom at the very top are miniatures of the couple. Morticia wears cascading black lace. Gomez smokes a cigar.
The shot of Fester with a face full of black smudges (after Gomez takes his photo) would become his opening credits portrait.
The sign on the front gate reads "Beware of the Thing".