Creator Backlash: Trent's actually not a fan of the band's now iconic Woodstock performance, considering it one of the band's worst. The myriad amounts of technical problems throughout the performance (Most famously Trent's keyboard breaking down halfway into Happiness in Slavery) probably had something to do with this.
In a 2005 interview with Spin, Trent Reznor commented about his opinion on The Fragile, nowadays considered one of Nine Inch Nails' best works. He associated the album with his mental condition in the late 1990s and criticized its lack of lyrics. Reznor believed that he made it out fear of whatever happened to him at the time, filling it with "an unimaginable amount of effort" while unable to think.
Doing It for the Art: Considering how he doesn't mind piracy of his albums as well as licensing more recent work under a non-commercial Creative Commons license, it's obvious Trent just really likes making music.
Trent has said that With Teeth was the only album his label didn't complain about when it was delivered to them.
TVT Records was rather upset with Pretty Hate Machine because Reznor refused to be turned into Depeche Mode Part Two. Steve Gottlieb, TVT's founder, then tried to sabotage the recording of Broken and Trent's move to Interscope.
Official release of Closure on DVD was barred for so long that Trent just released the .ISO files of the DVDs online himself.
Keep Circulating the Tapes: Oddly enough, Pretty Hate Machine was out of print for a while between the late '90s and 2005, owing to Trent's dispute with TVT.
Throw It In: A recording of Sean Beaven being bitten by Trent's dog Maisy appears in "Physical".
The drum solo in "Piggy" was a placeholder for a better drum solo later, but Trent liked it too much to lose it.
Trent once said that the guitar solo in "Ruiner" was so over-the-top in corniness that it had to be in the song. Ditto for the entirety of "Big Man with a Gun".
What Could Have Been: Reznor had considered doing quite a bit to promote Year Zero, including blowing up a building, arresting actual fans, and even staging an appearance of the Presence in real life. Of course, these never happened for various reasons.