Both hosts of the revival, as well as original host Mike Adamle (longtime NFL sportscaster; later of WWE "fame") and former NFL greats Joe Theismann, Todd Christensen, and Larry Csonka.
During the second half of Season 1, longtime NFL referee Bob McElwee served as the show's referee.
Michael O'Hearn (Titan in the revival) is also known as Michael O'Dell in the Gladiators clone Battle Dome. He also was a Gladiator on the original's live tour, named Thor. He would later set the Guinness World Record for most panes of tempered glass run through consecutively, on live television.
Gina Carano's appearance as Crush boosted her MMA career for awhile.
Old Shame: Possibly Joe Theismann and/or Gladiators Malibu and Sunny, considering the DVD release begins with the episode immediately following their last — which, ironically, was dedicated to recapping the excluded first half of Season 1. Yes, the first half of Season 1 was incredibly ghetto compared to everything that came after it, as well as including various aspects that were dropped (such as the Gladiators being clear villains), but it seemed as if the omission of #1-13 was advertised as a feature.
To clarify, many shows have "bumps" during their first year as they figure out what works and what doesn't, which is why a full-season box set is fun to watch. As such, if you advertise that you'll release Season 1, don't end up putting out "Season 1: Episodes 14-27" — and especially not under such a misleading title of "The Battle Begins" (which itself implies a full-season set). A rare mis-step for Shout Factory, who are generally better than this.
The Other Darrin: Lace was changed from Marisa Pare to Natalie Lennox in the fourth season.
The Pete Best: As mentioned above, Malibu and Sunny (who only appeared in the first 13 episodes) are generally not remembered as Gladiators. This might have happened to Zap as well, but she returned later in the run. Malibu would do tours on the live version as well.
Retroactive Recognition: Plenty of Gladiators made this their first "acting gig". Probably the most notable is Lee Reherman, aka "Hawk". Lynn Williams (Sabre) would become Jax in Mortal Kombat Annihilation.