Author Existence Failure: Nilsson began recording a comeback album starting in 1993. It's been reported that he managed to finish the album a few days before his death. A few tracks have been leaked, but there's never been any indication that the album, provisionally titled Papa's Got a Brown New Robe, will ever be released.
Breakthrough Hit: "Everybody's Talkin'". However, it actually flopped when it first came out in 1968. It was re-released after being featured in Midnight Cowboy the next year.
Follow Up Failure: Son of Schmilsson wasn't a flop by most standards, but after the huge success of Nilsson Schmilsson and "Without You", the fact that it only could climb to #12 in Billboard, and none of its three singles could even make the Top 20, was viewed as a big disappointment.
Magnum Opus Dissonance: Though the general listening audience are mostly split between Aerial Ballet, Nilsson Schmilsson, and Pandemonium Shadow Show as being Nilsson's Magnum Opus, the man's own opinion was that A Little Touch of Schmilsson... was his best work.
He was also very proud of Knnillssonn and its commercial failure led to his disillusionment with the music business.
Reclusive Artist: At least when it came to live performances, i.e. he never played a single formal concert for a paying audience. At all. Closest he came was a BBC TV special (but even that wasn't "live", as such) and a few appearances at Beatles conventions where he sang a song or two.
Screwed By The Label: Knnillsonn, his attempt to Win Back the Crowd by re-creating his classic 60s style, was released in July 1977. A few weeks later Elvis died, giving RCA Records an excuse to ignore Nilsson while pushing the lucrative Presley catalogue. A year later they released a Greatest Hits Album against his wishes, prompting Nilsson to ask to be released from his contract.
The Shelf of Album Languishment/Short Run In Peru: Flash Harry was recorded after he left RCA and didn't have a recording contract. Mercury picked up the album in 1980, but their American division passed on it. It ended up just being released in the UK and Japan. In 2013 it finally received an official US release.
Working Title: He wanted to call his first album for RCA Something Wicked This Way Comes, as a Shout-Out to the Ray Bradbury novel, but ran into legal trouble with Bradbury's publishers. He retitled it Pandemonium Shadow Show, after the traveling carnival in the novel.
Duit on Mon Dei was originally called God's Greatest Hits, but RCA rejected that title.