Some game facts

[LJSTAR]

Super Smash Brother Brawl (Wii)
- Six character where removed from the final game, those were :
*Dr Mario
*Mewtwo
*Roy
*Pulse & Minum
*Toon Zelda
*Toon Sheik
*Dixie Kong
(Notice that some files with their name is still present in the game's iso)

- Some music were removed.
- Some character was supposed to have a "damage" texture (Broken mask for Meta Knight for example)

(Source and more at : Unseen 64 )

Puggsy (Genesis)
- If you play an illegal copy of the game, after the 5th level there is a message that appear to buy the real game instead of playing "This silly copy" (The Anti-Piracy is contained in the SRAM of the game)

(Source : Video by "darkangelsv1" )

Tales of Eternia (PSX / PSP)
- If the optional boss "Sekundes" got his HP under 50% (in Normal Mode) and a character cast "Indignation", a different version of that magic would be used (with a cut-in of the character) and kill him in one strike.
(A Cameo from a previous Tales of games, "Tales of Phantasia")