it's not ok to yell fire in a packed movie theater room
The concept here is that yelling fire in a packed movie theater creates a "clear and present danger". It is clear that yelling it will cause people to run for their lives, and it is present in that people will react before cooler heads can put things into perspective. With a book, the reader has plenty of time to consider the consequences of their actions. So no, I don't think it spills over into books.
Also note the "clear and present danger" test was replaced in 1969 with "imminent lawless action" which is more strict.