A Piece of the Action?
1. I avoided this guess since the Horizon's contact came before the Non-Interference Directive went into effect. That said, it was one the main themes of this episode, so, I guess it could apply to the clue. I guess Kirk was trying to prevent more advanced technology falling into the Iotians's hands but they failed miserably; in the end, McCoy left a communicator in Bela's office. And we learn that the technical basis for everything is the transtator. In addition, Kirk demonstrates the follow advanced technologies: teleporter, ship phasers, ship sensors, hand phasers, communicators, subspace communication, computers, and other surveillance tech.
2. The first thing Bela Oxmyx offers at first contact with Kirk is a drink. "Make yourself a drink, Captain. It's good stuff. I distill it myself." Kirk ignorantly turns it down (Bela probably thought this was a sign that Kirk's position was weak). At the end, to celebrate the new deal where the Federation gets a 40% "piece of the action", Kirk asks Bela Oxmyx to "Let's break out some of your drinking stuff and celebrate the syndicate." Now he gets it.