Tales of Symphonia had the Palmacosta Lighthouse, where you're conspicuously barred from entering because "a bunch of people have fallen ill after entering" or something like that. Sounds like a hook for a future sidequest!
...except, you literally never go in the lighthouse and the game never mentions it again. Turns out it was a sidequest that was never finished, but they didn't bother to remove the NPC who alludes to it.
It also annoyed me when tracks for other dummied out content remain in the game's sound test, because it made me feel like I hadn't unlocked something yet (this practice seems less common these days). For instance, Sonic 2 had the Hidden Palace Zone music still in the sound test, Diddy Kong Racing had a random track that never played in the game, and Super Smash Bros. Melee had voice clips for Master Hand, Crazy Hand, and Giga Bowser that made it sound like they were unlockable or playable.
Did Chronicles include it or did they just scrap it completely? ---