This is actually why many shows have what is usually referred to as a "Bible" - a book with lists and descriptions of important continuity facts. For example, if you're going to say that your main character went to the University of Miami in one episode, that gets jotted down in the Bible, and future writers can simply read the Bible to see that the character went to that university, so they don't write a scene where the main character mentions having gone to another school.
Writers in general don't really have time to sit and watch dozens of hours worth of previous episodes (and it gets worse the longer a show runs), taking meticulous notes on every facet of a character's history or noting every single throwaway line. Having some sort of resource to consult let's a writer get the details right without having to waste massive amounts of time they could be spending actually writing.
Some shows with smaller budgets, or where the producers don't personally consider continuity to be all that important, may not bother having one, and those are the shows you'll notice tend to have more continuity errors than shows where obsessive notes are kept for every character.
reply
share