As I was administering the CAHSEE (exit exam) last week, a student called something to my attention which I find ironic and humorous as did he. One of the questions contained a grammatical error. I do not recall the actual question but it was a was/were confusion, for example "this sentence were lengthy". You'd think a state exam, testing the high-school proficiencies of students, would check their exam before publishing it, to make sure it was high school level and free of error.
Maybe the exam "meant to do that to see if you're paying attention".