For posterity I am answering my own question, there was indeed a BBS contest demo. Its the non-interactive demo that we already have. That demo that we have is unpacked, the original was in an installer file and came with README.TXT and CONTEST.TXT that explain the competition.
Here they are:
README.TXT:
Thanks for downloading the Day of the Tentacle demo. This demo has
voice and music for those of you with a Sound Blaster or SB compatible.
Adlib users will be able to hear the music only.
To run the demo just type "install". Follow the onscreen instructions
You will need 535k free memory. A small help file is available by
typing dottdemo help.
Be sure to enter our demo related contest for a chance to win this
zany new game.
CONTEST.TXT
APRIL 15, 1993
"Read my suction cup . . . no more taxes!"
Are you forking hard earned cash over to Uncle Sam? Elect Purple Tentacle
ruler of the world, and never pay taxes again. After all, when tentacles come
into power and humans are kept as pets, you'll never have to file another
1040 form (of course, you'll also be forced to sleep in a cage and do stupid pet
tricks at human shows).
Is this the warped ranting of a crazed, power-hungry politico? NO! It's the
warped ranting of LucasArts Entertainment Company announcing its newest
game, Day of the Tentacleª. This sequel to Maniac Mansion¨ is a wacky,
interactive cartoon comedy in which you must stop tentacles from taking
over the world. Controlling three off-the-wall kids (who wind up in three
different time periods), you scramble to turn back time and prevent tentacle
takeover.
The IBM CD-ROM "Enhanced Edition" featuring the voices of professional
actors throughout the game and the IBM disk-based version with a "talkie"
introduction will be available this summer.
CURIOUS??? Take a look at the Day of the Tentacle demo.
Want to GET SOMETHING FOR NOTHING when the government is
sucking every penny out of you? Enter the Day of the Tentacle drawing and
qualify to win a FREE Day of the Tentacle game. Here are the details:
Answer the following three questions about the Day of the Tentacle
demo correctly, and qualify for a drawing to win a free game:
1) Tentacles come in TWO designer colors. What are they?
2) Drinking toxic waste can make you . . .
(a) Greener, more radioactive,
(b) Smarter, more aggressive,
(c) Deader, more inactive
3) Green Tentacle asks for what from Bernard, Laverne and Hoagie?
(a) help,
(b) money,
(c) respect
Mail your answers, along with your name, address and phone number
to
Green Tentacle,
P.O. Box 10307,
San Rafael, CA, 94912.
No calls will be accepted. Deadline for entering is June 1, 1993.
IMPORTANT:
WRITE THE NAME OF THE BBS FROM WHICH YOU
DOWNLOADED THE CONTEST ON THE OUTSIDE OF YOUR
ENVELOPE.
The drawing will run for 8 weeks, so you have 8 chances to win a free
game (LucasArts will accumulate entries until the end of the contest).
Winners will receive their games 3 to 4 weeks after the product's
release this summer. Green Tentacle will contact winners by mail.
ALL entrants will get a FREE Day of the Tentacle hint book and FREE
shipping and handling WITH purchase of Day of the Tentacle
($59.95 for floppy or CD-ROM version) DIRECT from LucasArts. You
can do this two ways:
1) Send a check for $59.95 with your contest entry, and specify
which format you want ("CD" or "floppy"). LucasArts will pre-
order the game for you, and send it to you with a free hintbook
and no shipping or handling charge. REMEMBER -- the game
releases this summer, and you can expect to receive it in the
mail 3 to 4 weeks after it releases. OR,
2) Call 1-800-STARWARS 1 to 2 weeks after you enter the
drawing (gives LucasArts time to process your entry), and let
LucasArts know you entered the Day of the Tentacle contest.
Pre-order the game with your Visa or Mastercard, and when it
comes in we'll send it to you with a free hint book and no
shipping or handling charge.
If you win a free game after you send LucasArts a check, we'll refund
your money or not charge your credit card.
IMPORTANT: To receive the free hint book and free shipping and
handling, you must order the game by August 1, 1993.
TAKE NOTE: No purchase necessary to enter. Only one entry per person,
please. Winners consent to the use of the their name for promotional
purposes. LucasArts Entertainment Company is not responsible for lost or
misguided entries. Illegible entries will be disqualified. Employees of
LucasArts Entertainment Company, Lucas Digital Ltd. and Lucasfilm Ltd. and
their families are not eligible to enter.