Not anything really noticeable- our only quickly fixed issue was my kiddo had kids club band charge despite her never getting one (we brought her +band)
the poor kids club workers needed a stiff drink the first few days as their sensors weren’t playing nice with I assume the +bands as it kept constantly beeping and sounding alarms but I saw many IT looking people around the next days and never heard the alarms again..
It being the first sailing the crew had to break/adjust their spiels which you could tell by the end was getting on autopilot to say card or band. It was about 50/50 if we had to remove the band or just tap and it became more 70/30 by the end as the tap buttons slowly were rearranged-
They’ll need to outfit the mobile bar servers with devices as that’s the pinch point I saw as they’d often have 2-3 bands in hand filling orders which had 2 been the same could be an issue..
I wasn’t necessarily impressed with the light up parts (they were fun to watch in animators 2nd night)