Bob - that was my thinking too, from experience on other projection rides, was that 60 scans per second was the most likely - so I had my shutter speed at 1/60 through the ride. That was just fast enough to counter motion but not so fast as to exceed the refresh scan.
As for the mystery carrots...interesting! I've only ridden that ride one time, back in July 2016 not too long after it first opened. If Bob's shots were just last week - when were Havoc's shots? I'd have to guess that the carrots were added later. I wonder if any other scenes were changed or modified?
In my closer shot of the reindeer, the cart is just visible at the bottom of the frame, but mostly unlit - i can't tell if the carrots are there and the projection just isn't turned on, or if there's nothing there at all:
Here's one of the ending scenes of Anna and Elsa...anything look different here?:
And I agree on the high ISO - it's just fantastic how much we take for granted the ability to just shoot any low light scene without really having to think or worry about ISO - with cameras today being comfortable at ISO12,800, and even pushing to stupid levels - APS-C can get by at 51,200 and full frame can exceed 200,000! It makes 'auto ISO' so much more useful when you can set to such a high upper ceiling and set a minimum shutter speed, and basically not think about it.