Ironically, SEGA's GD-Rom technology was created as DVDs were not available for SEGA, and they wanted to create a disc that would be hard for pirates to copy and use.

"Sega intended to use the format to curb piracy common to standard compact discs and to offer increased storage capacity. It is similar to the standard CD-ROM except that the pits on the disc are packed more closely together, resulting in a higher storage capacity: around 1.2 gigabytes, which is almost double the storage capacity of a typical CD"

The Dreamcast is infamous for being the easiest console to pirate games on.

Shoichiro Irimjiri claimed that the Dreamcast's logo is supposed to symbolize the "origin of power", as the universe is "like a vortex."

The PAL region logo was changed from red/orange to blue to avoid any legal conflict with German publishing firm Tivola, who also used a red swirl in their logo.

Sega made a lot of unreleased hardware for the Dreamcast including, a Dreamcast DVD Player (which was a rumored empty shell), a Zip Drive, a Swatch Access, and a VMU MP3 player.

There was a motion controller planned to release for the Sega Dreamcast. It would have been used for 'Air Nights' a sequel to 'Nights into dreams' and was also rumored to have involved with the creation of the Sega's Super Monkey Ball series. The motion Sensing technology was eventually used for the maracas in Samba De Amigo.

If you open a Dreamcast VMU, you can see "potato" printed on a chip, as a joke referencing a "potato chip".