Visible crew/equipment: When Verbal drops the Zippo lighter in the police office, Chazz Palminteri leans down to pick it up. When he leans down out of frame, there are 2 "C-stands" visible in the background. These shiny, adjustable stands are general-purpose utility holders on a movie set, used to position lights and light control material for a setup (i.e. flags, scrims, diffusion, etc).
Visible crew/equipment: When Kobayashi and Edie are meeting, what appears to be a boom mic is visible above Keaton's head when the group is seen through the window.
Visible crew/equipment: During Keaton's interrogation at the police station, he's punched in the face. Then it cuts to Keaton being placed in the holding cell, along with the other detainees. As the camera tracks toward McManus, we can see a wired mic clipped directly below Hockney just as he says, "Fenster, will you relax." (00:12:20)
Visible crew/equipment: After Verbal tells Dave Kujan, "Nobody argued with Keaton, they just set their minds to whacking Kobayashi," it then cuts to the office building as Kobayashi and his two bodyguards walk inside. When the camera passes in front of the reflective surface of a pillar, we can see the camera operator, camera on a moving dolly, the dolly tracks, boom pole, and other set equipment in this reflection. (01:07:35)
Answer: Soze ended up back under arrest and for some questioning as 'Verbal Kint'. He never really vanished, he's just playing two parts/people. He really vanishes off the scene by the end of the movie after he tricks Kujan.
With the exception of what's known to have happened on the dock, the entire story is a lie told by Verbal Kint to Agent Kujon. Kujon realises this after Kint leaves the office but not in time to catch up. The entire movie is about a habitual liar making up a story about what happened on the dock. He may be Keyser Soze or an alter-ego variant but even Keysers rep is subject to question as it was told by the same liar. Verbal himself said about Keaton, "He was a grounded guy, a cop. If you think the husband did it then you're right." He was telling on himself as sociopaths will do when they think they're smarter than everyone around them.