Second time in as many months my credit charge turned out to be higher than the amount on my signed receipt. In October it was on my Discover card and this month now on my AMEX. Mysteriously both times the charge was bumped upwards from the signed amount. Last month after realizing it I called and spoke with manager who was polite but then never called back. My advice is check your receipt and if possible pay with AMEX if using credit card since the process to dispute is pretty simple.
Food and drink is great though! :).