Do you go back to correct a charge if you realize you've payed an incorrect amount? (food, clothes, etc.)
It depends when I realize it. If still parking lot, yes. If at home, no.
If I'm overcharged, then yes (assuming its a more than a 5 bucks).
If it's more than $5.00, I will go back (assuming I have time to do so).
If it's less, I may, but I likely wouldn't.
I had a $5 coupon at work as a thank you for staying late from my boss. They still charged me the full amount minus employee discount in the cafeteria. I didn't bother correcting the cashier to get my $5 back.