When the first male goes into the auction, the sounds heard from inside are of a real auctioneer, nothing like the style of Cassius' auction of Buck.
When Buck first meets Cassius Buck uses a spin kick to disable him but doesn't come close to hitting him.
During the auction, when Cassius Thorne commands Buck Rogers to "show the merchandise", he presses the button for dis/arming the hand cuffs.
Verifiable as seen in the jailbreak scene, the button towards the center of his belt arms it, when Buck get ornery Cassius hits the one closer to his hip, sending an electric shock.
When Buck is in the star fighter, he brings up the scanner specs of the ambassador's cruiser, as the next scene shows, the design is totally different than what the scans were on the screen.