* HeyItsThatSound: The original BonusRound timer was recycled on ''Classic Series/{{Concentration}}''.
* ScrewedByTheNetwork: Allegedly, the Rafferty run was just time filler for NBC until ''Classic Concentration'' was ready.
* TechnologyMarchesOn: When the UK version first started, all contestants received a dictionary (later an encyclopedia). Now, everyone who plays wins an E-book reader.
** Much like ''Classic Concentration'' after it, the Rafferty version updated the board with computer graphics.