Box Office Bomb: Budget, $80 million. Box office, $38,345,494 (domestic), $98,376,292 (worldwide). The Rotten Tomatoes consensus accused Ivan Reitman of attempting to remake Ghostbusters (1984), and several critics panned it for its liberal usage of Toilet Humour and Squick regarding the enemy aliens. It got an animated continuation that same year, but said show ran for only one season. Reitman would not direct his next cinematic movie for five years.
Creator Backlash: Don Jakoby's original script was far more serious than the finished product, thanks to credited co-writers David Diamond and David Weissman. He wasn't happy about it.
According to some design sketches, the final form of the alien's evolution would've been a much more humanoid form. However, seeing how difficult it how to make this a realistic threat, instead they went with the giant cell.
The mall that features in the third act was, in reality, a ghost mall abandoned for several years. The production team added store fronts and set dressing to make it look fully functional.
According to Ivan Reitman on the commentary track, contrary to popular belief, the prominent feature of Head&Shoulders was not a case of product placement; P&G wasn't approached for placement, no money was paid for the appearance, and the bottles shown were acquired by the production.
There are a few unused tracks in Evolution Worlds, including all of the dungeon tracks from World of Sacred Device, either as leftovers or an indication that those dungeons were meant to be in the game at one point. In the final game, the dungeons in the first half use the Blaze Ruins theme from Far Off Promise.
Additionally, there are (dubbed!) voice clips for the NPCs of the Pannam Port and the KronPrinz including lines for the various Mooks from the Battleship Raid in the original. Given the fact that the first game didn't even have voice acting outside of the occasional battle grunt/phrase to begin with, the presence of dubbed voice clips, much less anything clips at all, could be an indication that the first game was meant to be preserved more closely than it ended up being.
Market-Based Title: The name of the Gamecube port is Evolutia in Japanese and Evolution Worlds in English.
Porting Disaster: Evolution Worlds. Considering how unfinished the entire second half of the game is, it makes you wonder why they would consider packing both games on one disc considering the way they mangled the first chapter.
What Could Have Been: Mark Jindrak was at one point slated to be part of Evolution, but for unknown reasons Batista joined instead. The rumours suggest that Triple H had taken a liking to Batista mostly because they would work out together and became gym buddies.