Sonic
He has an unused texture that was used for beta series where he has a sonic cd texture
Hatterene
This character was cut due to debugged moves found in it so they replaced Hatterene with Athena for the dlc coming
Saffron City
This music was switched because the song was very depressing so they changed it to something happy. The unused music is now used for the Fountain of Manorra
Sound of something lighting up
This was used for the Fountain of Manorra when lighting a candle near it
Unused Extra named "Gems Collection"
This was used in the beta version of the game when you press the button it shows how much Chaos and Sol Emeralds but it was replaced by Chaos Emeralds and Sol emeralds were removed..
Mario
Mario has a unused moustache texture which looked very stupid so they replaced it with a much better moustache
Corviknight
This character was cut same as for Hatterene this bird was replaced by Terry(Yup the characters were not Terry or Athena yet)
Sylph Corporation
This song was switched to a more epic version. The unused music is now used for The Battlefield
Sound of door creak
Tickets
In the series game, there was a unused tickets selection which shows how many tickets you collected in your adventure but somehow changed to Collection
Mr Legends
Mr legends had a unused feather left when he used his fire attack and he has a feather near his head so they removed it cause it meant something really bad
Froakie and Frogadier were cut and replaced by Popplio and Brionne
Indigo Plateau
This theme was switched to a type of challenge road. This unused theme is now used for the Elite Six rooms
Sound of someone saying Yeah!
This sound was used when you get a 1-UP
Character Stats Editor
Jared Valdez(A hacker in the series)
This person has a unused hack texture with random numbers but they made him into a different character instead
Red,Blue,Green
These characters were meant to be the main characters of series 6 but they were cut due to a DMCA and replaced by Jill, Eyozen, and Urmies
Gym 1,5,8.
Those themes were changed to a cooler theme. The unused music is now used for battling Boss Rush
A DKC2 sound
This was the game over used when losing to something and it was replaced but then it came back
Classic Mode
Classic Mode was a feature changed to Adventure Mode due to copyright of smash bros
SCP 7289
This SCP was named Bluewill the fish but someone else was named that(will be changed soon) anyways he had a unused mouth but it was cut to a more cool mouth
Ryo Sakazaki
This character was scrapped and replaced by Will
Challenge Road
The theme was changed to a more type of cool beat. This unused theme is now used for Splatter house 3rd Floor
Sound of a fan
This was the fan used in the SCP Foundation but was somehow removed for no reason...
Sound Test
Sound Test was changed to Jukebox instead because of sonic copyright