When Jaime loads the tape onto the recorder, the supply reel in the closeup shot is different from the one she handles in the longer shots.
Only the three OSI agents are present at the concert hall backstage when two of Penn's goons hold them at gunpoint, yet after Jaime yanks the drape down, a fourth man suddenly appears with Jaime and the others, wearing blue overalls and holding the rope that Muffin later uses to lasso Penn.
When Jaime powers up the studio equipment, the outside red "RECORDING" warning light goes on (this is probably what alerts Buck that there is someone in the studio, despite Jaime's having eluded the security devices), yet Jaime merely uses the tape machine to play back the recording. If the machine had indeed been in the "record" mode, the tape would have been erased as it spooled off, not simply played back.
Tammy asks Buck's musicians to play the piece of music over because the mandolin-player's sound level was not loud enough on the master tape. Buck's recording studio is fitted with wide-tape multi-track recorders, so each musician would probably be recorded on a separate tape-track. So if Tammy had wanted one of the musicians to play louder on the recording, she would not have erased the entire tape and started over with everyone playing together again; she would simply have asked just that one too-softly-playing musician to don headphones and re-record his own musical track while listening to the other band-members' already-recorded tracks; the other musicians would not have had to re-play their own parts, also.
It is implied that both Tammy and Buck would have to go to prison for espionage, but it was only Tammy who had knowingly/voluntarily doing anything illegal --- Buck knew nothing about the crime till Jaime informed him of it, nor was he actively involved in it till the live performance at the end, and even then he was cooperating only because he'd been threatened with Tammy' death if he didn't comply. So although Buck probably would indeed be temporarily detained and have to appear in court to testify, he would not likely be convicted of any intentional wrongdoing.
The bionic "up we go!" sound is heard before Jaime actually starts to jump over the invisible fence; the sound starts as she is crouching in preparation for her spring.
The first close-up view of the studio tape-machine shows the VU meter's needle waggling at the midway point, indicating a medium-strength fluctuating "beat" in the sound-level, as would be shown if the bouncy instrumental/percussion base-track that had been playing on the machine was still running. But the song is actually ending, and so the music is just a fading-away "final strains" sound of "smooth" melody tones, with no beat or other "sharp transitions" that would make the sound-level meter needle move or even be much above -3db.
The sign "Ventura Air Force Base" indicates that the base is located in the county and possibly the city of Ventura, California. However, the "Caution" sign on the fence to the left are marked with "L.A. OR 96772" (Los Angeles Ordinance 96772) and another "No Trespassing" sign is marked with "L.A.M.C." (Los Angeles Municipal Code).
Buck had seen Jaime's OSI card and had just heard Tammy refer to Jaime by her real first name, so he would not have spoken of her as "Jodie Lee" after learning that Penn had locked Jaime and Muffin inside Buck's burning studio.
Tammy instructs her assistant to "bring it up two" on the sound board, yet in the subsequent close-up shot of the level being increased (and the high-pitched code-tones sounding as Jaime hears them), the man's hand clearly moves the mixer's Glide-Path control considerably further forward than just two marked db-level-graduations on the board.