There were a couple of sessions from 'Alien 3', 'Sphere' and 'Batman' that I remember watching back in the 90s. I don't recall seeing Goldenthal conducting at all. I do remember, however, there were long segments (one of those news crews that were shooting behind the scenes for HBO and E!) on 'Batman & Robin' and 'Batman Forever'. For a week or so the filming crew would follow the composer. Elliot was plastered most of the time. The music was still being written. They pulled one of the musicians off their instrument to go into the back room to help finish an orchestration that Shirley Walker (she must have filled in for Jonathan at some point) was working on. The atmosphere was charged with frenetic energy. Elliot would pace back and forth in the control room - sloshed yes, but still very connected to the process.
One impression that always made me smile was that every recording session seemed to be starting too early for Elliot unless it was starting around midnight. He would walk in (usually last minute or a bit late) looking barely there, but the good musicianship that would immediately start filling the mix booth was always like an instant tonic. Elliot just loves great musicians, no matter what the setting.
As for 'Batman & Robin', the experience for Joel Schumacher was not all that warm and fuzzy by the end of the scoring dates. Joel was a recovering alcoholic at the time and Elliot was a practising alcoholic in a big way. He'd walk in loaded. Slurring his words. Nodding out during takes. He did look really good on that video from DVD, but that wasn't the way I remembered it. It kind of tarnished Elliot's reputation in Hollywood. He became a bit of a liability. Sorry to say so, cause he's an immense talent.