TV bumpers and continuity (lost advertising material; 1972-2003)
Unlike national television and movie company logos, the bumpers and continuities for networks and local stations are not always readily available. Online postings of off-air vintage recordings are plentiful, but there still remains some continuities, bumpers, etc. that have yet to surface.
- FOX Kids commercial bumper, 1990
The early days of FOX Kids used animations to mark the beginning and end of a commercial break. One curious animation involved an Old West type shootout between a cowboy and three bandits or "villain"-type cowboys. He hits all three, which turn into something resembling talking pieces of popcorn. When the commercials are over, the "popcorn" sprouts back into the outlaws.
Some people remember it being seen on Saturday Morning airings of "Bobby's World."
- Materials from WXTV 41 (Spanish language network out of NY/NJ area)
So far on YouTube, surfacing footage includes: Star-Spangled Banner video used by the station (WXTV used the same footage as WPHL in Philadelphia and begins with an acoustic rendition that fades into a full orchestra). Chicago's Fuzzy TV Memories has the "SIN" (Spanish International Network, pre-Univision) opening logo that would have been seen on WXTV. Audio from a 1970s WXTV sign-off also exists online. 
- Materials from WNJU 47 (Spanish Language network out of NY/NJ area)
- WPIX "Popcorn" technical difficulties screen
Some viewers recall that when WPIX, Channel 11, in New York experienced operating difficulties, they would use a slide/graphic with Hot Butter's "Popcorn"  playing in the background.
- HBO (Early years, 1972-1980)
Material from 1977-80 has been found, but as for the 1972-1976 materials, all that has resurfaced over the years is a set of very rare Feature Presentations from 1975, in Computer Image Corporation's Demo Reel (appearing at 6:19-8:46), as well as their broadcast of the 1973 Pennsylvania Polka Festival.
- Showtime (Early years, 1976-1980)
At least one video from this era is known to exist, taken before an airing of The Other Side of the Mountain from March 14, 1979. https://www.youtube.com/watch?v=nB5KLOGKVYI
- Take 2 (Channel, 1979-1980)
One of HBO's channels, of which nothing, has resurfaced.
- Festival (Channel, 1987-1988)
Another one of HBO's channels. Same as Take 2.
- You're Watching Disney Channel Adam Lamberg Wand Bumper (2003)
To be announced.