1 - the marketing guy didnt listen to advice 2 - the developer introduced the problem
If the person giving the advice isnt there to say "Hey i already told them that ! but they didnt listen" they can declare it as a mistake or an unknown bug. Usually people dont get fired for an unknown bug and dont look "as bad" as if they where told and chose to ignore it.
Happened at my work a few times, engineer didn't get to the point of being sacked but when the severity 1 solution was ignored in preference of another more "stupid" solution proposed by business types the engineer that suggested the proper solution was never invited to meetings anymore. Then when the initial solution didnt work and used the said engineers solution they didnt even tell him they implemented it until weeks later when he found out indirectly.
[edit] hmm, after reading it again, its either what i wrote above or someone lied and said QA didnt find any problems so we shipped it based on their recommendation(which in my opinion is worse then a way to keep his mouth shut)
"The game shipped.
I got fired from my job at Dairy Queen in high school, but that's another story!"