The Addams Family Tree - S1-E5
Continuity mistake: When the mailman opens the mailbox to drop in Adam's mail, Thing snatches them and then closes the box. When Wednesday goes to the inside box, Thing hands her only a single letter.

Starring: John Astin, Carolyn Jones, Jackie Coogan, Ted Cassidy
The Addams Family Tree - S1-E5
Continuity mistake: When the mailman opens the mailbox to drop in Adam's mail, Thing snatches them and then closes the box. When Wednesday goes to the inside box, Thing hands her only a single letter.
Morticia: Mr. Addams' treatment for Grandmama's back had the whole medical world agog.
Gomez: Agog? Aghast.
Trivia: John Astin (Gomez), Carolyn Jones (Morticia) and Ted Cassidy (Lurch) are the only actors to appear in all 64 episodes of the show.
Question: How was effect of the light bulb that lit up whenever Fester put it in his mouth achieved?
Answer: Basically from what I understand, they stuck the innards of a small flashlight into the base of the bulb and put a little switch on it. When he put it in his mouth and bit down, his teeth would hit the switch, which would turn on the flashlight and made the bulb light up.
TedStixon