I've thought about Reno as well. Here is what I know:
1. FBI agents came from two locations: The Satellite Office in Reno provided two agents, (I believe it was two).
2. Red Campbell and three other agents came from Las Vegas. They arrived by plane a few minutes before 305 touched down. Red was in overall charge. He was also the SAC in LV. Red and one LV agent, plus the two Reno agents conducted the on-board retrieval. The third LV agent handled comms in the terminal.
3. All evidence retrieved went to LV. The tie went to Seattle on Monday. Cigarette butts apparently stayed in LV for decades until processing in 2002-3?
4. Red conducted the debriefing with the crew - Bill, Scotty, Andy and Tina.
Somebody posted recently that FBI agents were in squad cars along the runway. I had never heard that before.
All this information comes from Calame, his book, and related interviews and reading: O'Hara, Detlor, Himms, Carr, Dormuth. Geoffrey Gray as well. Most of this came in snippets - a tidbit here, a tidbit there.
I know of no local LE involved at Sea-Tac other than security in the terminal. One FBI agent at Sail's luncheon at the SYC, Sid Ruben, told us that the entire Seattle office was deployed at Sea-Tac, about 30 agents. They handled all issues including perimeter security and the latter debriefing, and at least one agent was on the runway with the plane - "John" who purportedly boarded the plane for a short period of time. At least one agent rode on the bus wit the passengers. I'm not sure how many agents were deployed on comms. J. Earl Milne was in charge at Sea-Tac. Charlie Farrell, the Norjak case agent, apparently stayed in the Seattle office that night.
I've never heard anything on the relationship between Seattle and Las Vegas. I've heard that there was tension between Seattle and Portland, especially regarding Himms, and this comes from Galen. There was also heightened tensions within the Portland Division, and Dorwin Schreuder left the FBI a year after the money find, according to his grandson's book.
The role of local LE at Reno is murky. Calame's book certainly describes it as being sloppy and chaotic, with Reno PD handling the fingerprint retrieval. But that reality is challenged by numerous official FBI accounts. Local PD must have brought the dogs on board - I believe there were two - and they were busy eating the crew's food, according to Bill Rataczak.