Films are frequently used instead of, not in addition to lecture presentation. Occasionally, a comment or question may lead an instructor to provide additional information. The general problem is, if you don't write it down, you will probably forget it. Haphazard notes can actually interfere with learning and understanding. Poorly organized notes consisting of disconnected phrases not under appropriate headings virtually guarantee misunderstanding and confusion.
Many systems are available.
Perhaps more important than which system you used, is that you actually apply one. With a standard linear method, letters, numbers, and indentations indicate which material goes together. If you missed something, please mark it and ask during the beginning of the next lecture. I am available to review your class notes with you during my office hours or by appointment.