The Commodore 64GS, despite its name, wasn't significantly different from the standard Commodore 64; its main upgrade was a built-in 1541-compatible floppy disk drive.
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The WonderSwan was the first handheld game console to feature a vertically-oriented screen, a design choice that proved surprisingly popular in Japan.
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The Nintendo 64 controller's unusual design was partly influenced by the designers' desire to make it feel comfortable in the player's hands, even during extended play sessions.
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The PlayStation 3's Cell processor, while powerful, was notoriously difficult for developers to program for, leading to longer development times and higher costs.
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