These are product advertisements placed in various gaming magazines to promote the release of Sonic 3D: Flickies' Island.
This advertisement shows a 3D rendered Sonic sitting in between a ribbon. It is for the Saturn version.
This clip advertises not only Sonic 3D, but also Sonic Blast while mentioning the Mootown snack products.
This contains the same 3D rendered Sonic but this time the advertisment shows actual screenshots of the Saturn version.