* FranchiseKiller: ''Black Knight''[='=]s poor critical reception and commercial failure seems to have killed off this series of spinoffs.
* HeyItsThatVoice: Japanese gamers will recognize Caliburn's voice as being the voice of [[OnePiece Sanji]] and [[Franchise/{{Digimon}} Leomon.]]
** The English version of ''Sonic and The Black Knight'' also has [[VideoGame/SamAndMaxFreelancePolice Girl Stinky]] as Merlina.
** Similarly, the English version of ''Sonic and The Black Knight'' also has Gavin Hammon, aka [[VideoGame/TheWalkingDead Kenny]], as King Arthur.
* VindicatedByHistory: More and more people have warmed up to these games, ''Black Knight'' especially. Some even think that ''Black Knight'' was the last good Sonic story before ''VideoGame/SonicColors'' onward took the series in a more comedic direction.
* WhatCouldHaveBeen: ''Secret Rings'' began life as a Wii port of ''VideoGame/SonicTheHedgehog2006'', with the developers experimenting on playing the game largely with motion control. Development then switched to making an all-new ''Sonic'' title exclusively for the Wii, designed to take full advantage of the hardware, and thus ''Secret Rings'' was born.
* WorkingTitle: ''Sonic and the Secret Rings'' used to be ''Sonic Wildfire''.
** For a short while between ''Wildfire'' and ''Secret Rings'', it was also going to be called ''Sonic and the Secret of the Rings'', but they took out the "of the" to make it a bit less wordy.
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