I knew the Cadillac Diner was not going to be a place I could eat, but I was hungry and roaming the ship one afternoon, and it was open, so I popped my head in to see what they might have that was safe.
The answer is, as I expected, not much. Basically, the chicken and the hamburger are it. I was told to stay away from everything else, including the mashed potatoes and the shakes. Normally the have gluten free buns for the hamburger, but they were out, so I had a plain meat patty. Not particularly memorable, but I appreciated the injection of protein in the middle of the afternoon.
The place does have a fun atmosphere, but I'd recommend that anyone on a GF diet avoid it.