Personally, I've made mistakes in daily normal tasks and know how it feels to have people make an issue out of little things. If the end result is the same (it goes in my gut and doesn't taste horrible), I'm not going to complain unless it's completely wrong. Paying for a $25 steak and getting chicken nuggets would be too far, but messing up a side won't ruin my day. It’s stressful working in a kitchen and I’d rather the workers not have too much trouble so long as the things I got taste fine.

I'm also unable to eat a certain common ingredient in cooking, and it's one that virtually every person on earth loves. I've found that complaining just results in them doubling that ingredient and I have no clue why. I've even gotten visible spit in my food before. Picking that ingredient out myself instead of mentioning it is usually better. I've grown a bit of tolerance for not getting what I want.

If I get a different package, it's probably not serving the same role, so I'll complain.

In most situations I would probably note the mistake to my friends after I was sure that the waiter was out of ear shot, but not make a big deal out of it. I can think of one person who I wouldn't say anything to until we'd left the restaurant; I know from previous experience that he would bring it up to the waiter.

I think my treatment of the service industry changed significantly in high school, when I actually knew people who were working at restaurants and heard their stories of horrible customers. Having since worked at a restaurant and eaten out with lots of food service people, I believe that food service people tend to treat food service people better than others do (though I've seen exceptions both ways). I'm not trying to say this in a claiming-moral-superiority-via-kindness way, it's just a pattern I think I've seen in the world, and I think it kinda makes sense given the nature of granfalloons.