There were complaints of sound issues during the Spice Girls' show, with some fans saying they could not discern what song was being played, but promoters insisted that this was down to the size of the venue rather than any specific technical issue.
"Melanie B you're wonderful up on that stage, Victoria you'll be missed, but here in spirit and Melanie C, what strength and focus you give us all, thank you".
The Wannabe singers - minus Posh - are due to open in Dublin, and Geri Horner is officially Ginger Spice again as she unveiled her newly dyed red hair.
The Spice Girls are scheduled to perform 12 more shows across the United Kingdom with Cardiff's Principality Stadium on Monday the next stop. "And hopefully the vocals and the sound will be much, much better".
Melanie "Mel B" Brown, aka Scary Spice, addressed complaints from multiple concertgoers that the sound at the Croke Park venue wasn't up to par, making the pop stars hard to hear.
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However, the concert was largely well-received from those who attended, with one fan tweeting: "Such a surreal night last night at the Spice Girls".
"There's something wrong when the crowd at a Spice..." Like a king or a queen, we celebrate you. "Got [sic] gonna lie I was prepared to be disappointed but good god they were UNREAL". "In '98, we started our world tour in Dublin so we truly are home".
The band announced their 13-date United Kingdom stadium tour in November, their first reunion since they joined forces to close out the Olympic Games in London in 2012. "It's got a very special place in our hearts".
Another added that while the women put on a great performance, it was marred by the poor sound.
After their Dublin show, the Spice Girls will perform concerts in Cardiff, Manchester, Coventry, Sunderland, Edinburgh, Bristol and London - finishing at Wembley Stadium on June 15.