This outdoor show was Queen's first and only concert in New Zealand.
Freddie Mercury got very drunk with Tony Hadley of Spandau Ballet before the show, sharing entire bottles of vodka and vintage port. Hadley was around only because their New Zealand tour dates had been suddenly canceled while playing in Australia, and later in the evening he would clearly ignore his manager's warning to keep a low profile.
Between songs (probably after the medley of old songs), Freddie did his usual falsetto vocal improv, and added, My voice is fucked!" According to a book on Queen, at one point he proclaimed to Hadley who was side stage (into his mic and thus audible to the audience) that he was "pissed."
Tony Hadley joined Queen for Jailhouse Rock (as seen in the second picture above). Roger Taylor recalled Tony didn't remember a single word of the song. He apparently ended up singing Tutti Frutti instead. He fondly recalled the day in a 2006 interview. Here's a pro pic taken during this song