Bugs Bunny's Howl-oween Special (1977)

Witch Hazel's house serves as the centerpiece of this Halloween anthology, comprised of nine Looney Tunes cartoons plus some new transitional segments. (Quality is obviously lacking in the newer material.) Although I was too young to catch this special when it originally aired on October 26, 1977, I grew familiar with most of these individual cartoons from watching the Bugs Bunny/Roadrunner Show in the 1980s.

Laverne and Shirley: The Haunted House (1977)

The gang heads to an old abandoned house in which Carmine informs the girls they could pick up a couch for free. But their friends seem to disappear one by one while inside the haunted mansion. (Synopsis from ShareTV.org) Originally aired March 22, 1977.

The episode isn't readily available online, but here's a recap and analysis from the Night After Night Podcast:

Happy Days: Fonsillectomy (1977)

Originally aired October 25, 1977. Fonzie is ill, and the doctor says he must go into hospital the next day to have his tonsils removed, meaning that he will miss the Cunningham's Halloween party. The Fonz does not take the news well. Worse still, the only spare place in the hospital is on the children's ward. (Synopsis from Wikipedia)

Wonderful World of Disney: Halloween Hall O' Fame (1977)

Originally aired October 30, 1977.

Fat Albert Halloween Special (1977)

This Halloween special isn't one I remember seeing as a kid (I was one year old when it first aired), but I discovered it a few years ago and have made it a part of my Halloween entertainment ever since. Fat Albert and the gang roam the neighborhood in search of "old people" to scare and other mischief, but by the end of the evening they will learn the truth about Mrs. Bakewell! Originally aired 24 October 1977.

Halloween with the New Addams Family (1977)

Originally aired October 30, 1977. A revival of the popular '60s TV comedy series "The Addams Family" has them preparing for Halloween in their own inimitable way.

Halloween Safety (1977)

Halloween is Grinch Night (1977)

I first caught this on TV sometime in the 1980s. The residents of Whoville "can tell by the smell of the wind" that another Grinch Night is on its way! This cartoon is not as endearing as How the Grinch Stole Christmas, and not much actually happens in the story. However, it is still entertaining and well-drawn. I found the scene where the boy, Euchariah, encounters the Grinch's nightmarish collection of monsters to be quite creepy. This cartoon originally aired 29 October 1977.