Oh the "platter of sandwiches for the judges" comment resonates with me SO much. I have done a bit of work as an extra on TV and movies and some productions are great, others treat the extras as cattle. Actors and crew get first dibs on the food, different food, eat when you want.
I was on a shoot for an EE ad about this time last year, it was a very early start and we had breakfast about 7am (provided), then rehearsed and filmed all morning, right through a normal lunchtime, there was a snack table set up with all sorts of crisps, chocolate and fruit but we were told that was for the CREW ONLY. 🙄Finally got "lunch" about 4pm when we were all starving. Other productiions are more reasonable but the talent - the judges, actors - are at the top of the pecking order and the contestants or extras are at the bottom.