These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Canadians Love Harry Nilsson: A number of his singles did better in Canada than the US. "You Can't Do That" and "I Guess The Lord Must Be in New York City" were Top 10 hits. "Everybody's Talkin' " made the Top 40 in its original release and hit #1 in its reissue, and a couple songs that didn't even chart in the US made the Canadian charts.
Covered Up: Nobody remembers Fred Neil's original of "Everybody's Talkin'" anymore. And conversely, Nilsson's "Without You," itself a cover of a Badfinger song, was covered up by Mariah Carey, her version being released weeks after his death.
Three Dog Night's hit version of "One", to the extent that many people aren't aware that it's a Nilsson song.
Harsher in Hindsight: "1941" gets a bit too uncomfortably close to real-life reports of Nilsson's domestic life.
"I'd Rather Be Dead" and "Down By The Sea" are about dreading the thought of growing old. He died at age 52.
Misattributed Song: If rock folklore is to be believed, an interesting case of an artist doing the misattributing. Nilsson heard Badfinger's "Without You" at a party and thought it was The Beatles. When he found out it wasn't he decided to do a Cover Version.
Sequel Displacement: 1967's Pandemonium Shadow Show is often called his debut album, but it was actually his second, after 1966's somewhat obscure Spotlight on Nilsson. It was his first formal attempt at an album, though, since Spotlight was just a hastily thrown-together compilation of various singles sides and unreleased songs.
Tastes Like Diabetes: A Little Touch of Schmilsson in the Night sometimes becomes schmaltzy as all hell.
"Easy for Me", his contribution to Ringo Starr's Goodnight Vienna album, from around the same period. Observe.