I heard about this years ago and just remembered it. From the link below:

"Santo Gold is without a doubt the most bizarre infomercial I’ve seen. This infomercial tries to do two very different tasks at the same time: sell a gold jewelry business opportunity and promote a “science-fiction space wrestling movie” called Blood Circus. Either one of these would be laughable enough on its own, but the combination of the two is downright unnerving."

http://www.infomercial-****.com/santo-gold/

I had this nightmare of a children's movie as a kid. It is definitely a trip. I think it, along with your guy's humor, would make a great Rifftrax short. Please consider.

Bridget and Mary Jo have done riffs on menstruation, the suburbs, and Tupperware, so they would be perfect to riff this early tribute to the shopping mall.

It's also in the public domain.

And it can be found here:
https://www.youtube.com/watch?v=O4VT9nOtClw

There's a lot of great cheesy 80s fast-food training videos out there, like for Wendy's and McDonald's. It's a riff goldmine.

It’s a very creepy claymation short (little over 10 mins) about a lady who dies but comes back as a zombie to get her purse. It features the devil, the dead lady, and her very young niece who now lives alone. https://www.youtube.com/watch?v=mIvQZm8K-yU

28 minute short I had to watch in elementary school.
A boy carves a canoe out of wood and sends it on it's greatly improbable way to the ocean.
Along the way, the canoe meets people and has adventures.
The canoe does.
Yes.
Really

Santa Visits the Magic Land of Mother Goose
The Magic Land of Mother Goose (1967)
https://www.youtube.com/watch?v=_TfxB00ikzk
https://www.imdb.com/title/tt0061936/?ref_=nm_flmg_dr_17

In keeping with the wackiness of shorts like Phoebe, this gives us a look at the strangeness of 1960s Canada culture. Bilingualism, mistresses, corporate intrigue, black & white film, plus an animated logo to take on Coronet and ACI. What could go wrong?

20+ minutes of pure madness to start your day right in our topsy turvy world today.

https://www.nfb.ca/film/instant_french_en/

It may be only half the length of Setting Up A Room, but it has twice the tedium! I remember flannel boards from Sunday School, but this takes them to a whole new level!

Hidden Hazards in Your Home - Narrated by William Shatner - I have a VHS tape dying to be riffed. It is a household safety video narrated by none other than the Man himself. I cannot view it because we don't have a tape player anymore, but I am more than willing to mail it to you for your use! Please let me know if interested! :)

Magic Kingdom: https://www.youtube.com/watch?v=mwFkpZgYaOo

Epcot: https://www.youtube.com/watch?v=mOEnWRfPlZU

Videos sold at the parks back in the early 90s that followed various families around. Presents lots of prime riffing fodder both from an early 90s kitch and promotional Disney standpoint.

It's a film called 'Blocks' from the same production company who brought us 'Setting up a room' it lasts for 17 mins, i don't know what this film contatins but i do know where it should be
https://www.worldcat.org/title/blocks-a-medium-for-perceptual-learnings/oclc/4273161/editions?referer=di&editionsView=true

This is the document we found a refrence to it https://files.eric.ed.gov/fulltext/ED112378.pdf
It's on page 98

A terrible educational folksy short on steam engines. I mean truly terrible, it starts with the narrator insulting the lead's wife and talking about how normal him loving an engine is. This has Kevin Murphy written all over it
https://www.youtube.com/watch?v=s8gnK9JaU7Y

The Christmas Light
https://www.imdb.com/title/tt7784186/reference
and its sequel ... or soft reboot(?), The Christmas Brigade.
https://www.imdb.com/title/tt9467594/reference

A 14 year old meets himself as a 21 year old wearing the same horrible sweater and the older teaches the younger him about table manners.

This educational short teaches kids about metric measurements in liters and volume; which sounds like a nice idea, if not for the fact that this short contains puppets that would make Jim Henson shake his head in disgust (or scream in horror).

Here is the link: https://www.youtube.com/watch?v=70k9gBICVQU and skip to 32:11.

https://www.youtube.com/watch?v=ab7rvuiIwi0

This short has three sections that literally sing the praises of the Clydesdales that pull the beer carts and two sections where a narrator talks over film of horses walking around.

The song is performed so forcefully and passionately you'd think they were singing about eight wild west folk heroes from Scottland.

The "BALLAD OF THE BIG ONES" is now available as a 33 1/3.

Laser-eye shooting animals, terrible animation, time travel, and a hodge podge of historical revisionism.

https://www.imdb.com/title/tt4791170/reference
https://www.youtube.com/watch?v=qB9rfBSexTc