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.
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.