Rise of the Robots
Instinct Design, the developer for Rise of the Robots, claimed that the game would feature 100 frames of animation per robot, with a special key frame system to ensure fluidity of movement. In reality, the game utilized 3 frames of movement for the robot punching, kicking and whatever else.
Cancelled Sega CD version
There was actually a Sega CD version in development, which was going to be published by JVC, but it was never released. A preview video exists, but it doesn't show anything from that version, other than a box cover. The "Work in Progress" footage shown was in fact from the DOS version.
Game covers mentioned that Rise of the Robots contained music by rock guitarist Brian May. While technically true, the only Brian May music you hear in the game is an approximately 5-seconds long guitar solo at the beginning. Brian May was penned in to produce the entire soundtrack, however completion was delayed and the soundtrack was not completed in time for the games release.
Extended CD-32 version
In October 2015 an extended and corrected "Special Edition" of the CD-32 version of Rise of the Robots was released. This fan made improvement by Earok is fixing some gameplay issues like the difficulty level and also adds aesthetic features like new backgrounds or the inclusion of the intro of the arcade version. This version can be downloaded for free.(Source: Unofficial CD32 Ports)
PC version differences
Rise of the Robots on PC was released on floppy disks and CD-ROM. The CD-ROM version had an animated intro instead of the stills as seen in the floppy disk version.
Information also contributed by CaptainCanuck, M4R14N0, n-n, Roger Wilco, and Verm --
Trivia contributed by Zhentarim7, Alaka, Jo ST.