As a TA I often attended lectures just to be able to refer to what students were just told. Often this information had not been processed or remembered very wel

As a TA I often attended lectures just to be able to refer to what students were just told. Often this information had not been processed or remembered very well by students. I always thought that lecturers, if there were multiple for a single course, would not attend one another's lectures under the pretense that they were busy, but with the actual reason that they didn't want to hold one another accountable for inefficient teaching methods. "I don't care what you do, you won't care what I do, the typos from last year's slides repeat."