term for out of a time period

Hello! I was hoping you could help me with a term I learned in High School. The term was used when something occured in a book/movie that was incorrect (or out of place) for the time period/setting of the story. I remember learning this in school, but I have searched many different ways, and through many helpful sites (such as yours!), and can not find the term.

Thank you for any help you can offer!

The word you might be looking for is an anachronism.