In the original Bioshock, there is a locked office belonging to an Australian man, where an audio log tells you his door code was set to Australia Day. Luckily for the player, there is a completely unsubtle poster next to the audio log that tells you when Australia Day is.
Except of course. The poster, and subsequently the code, is written MM/DD. Which is not how an Australian would write it. This has bothered me for years and hopefully Ken Levine will someday be brought to justice.