(written from a Production point of view)
Collins' team engaged in "ambush interviews" and meetings set up under false pretenses to garner many of the interviews for the film. He was able to interview George Takei, Grace Lee Whitney, Nichelle Nichols, Walter Koenig, Eddie Paskey, Bobby Clark, and Leonard Nimoy during their ten day filming window.
Collins had hoped to entice William Shatner to reprise his role of Captain James T. Kirk fighting the Gorn commander from the classic "Arena" episode but could not make contact with the actor. Collins' attempts to break into Shatner's mansion grounds to meet him were rebuffed when Shatner apparently released his guard dogs, creating an impression reminiscent of Monty Burns from The Simpsons. Collins also surreptitiously gained access to a Boston Public' filming location but was unable to find Shatner on set.
None of the Star Trek cast attended the reunion but Takei, Nichols, and Koenig did film brief cameos for a "USS Collins" bridge scene.
At the end of the film, Bobby Clark reprised his role as a Gorn while Collins played James T. Kirk in a recreation of the hand-to-hand fight scene from "Arena". Four years later, Shatner ironically took part in a humorous parody of the same scene in an advertisement for the 2013 Star Trek video game.