I don't really remember but if there was I would have corrected it by apologizing to students and directing them to the right answer. Teachers should be always careful about what they say and do but mistakes can happen. It should not be a big deal so long as mistakes are unintentional and we're open to criticisms which would give us all the chance to correct things and move on!
During my 39 years of teaching (3 at schools & 36 at universities), I adopted the policy of going fully prepared into each class or lecture. It is a major duty of the teacher to provide correct information & to be honest upon answering questions that are raised by students. Surely, there may be few odd difficult questions but the scientific reply ought to be "I don't know, let us seek a crystal-clear answer". This way, the students will learn to be vigilant & to not accept deceitful replies.
Saying the above, I (sometimes) give "deliberately" incorrect information to test the awareness of students. If I am caught by some smart students, my usual answer is "I am thankful for the awakened brains" & the correct information is presented collectively on the spot. This method of teaching praises the smart ones & inculcates the true information deep into the minds of students.
To use the term "completely inaccurate" is a stretch. I business and marketing in particular while core concepts have a longer life time, strategies are not only contextual but are also time based.
Remember today's innovation is tomorrow's norm and even ideas suffer from obsolescence. In such a situation the content of a strategy development course taught last semester may not be relevant two semesters from now. Does that make it incorrect? perhaps not but it its longevity definitely finite.