One thing about the lines in the movie - wherever possible, they quoted the book exactly. My bet is whatever Ms. Lee wrote, that is what was said up on that balcony.

I remember when I first read the book I thought he'd had a heart attack - that "passin'" meant "dyin'" - so I cried rather more than necessary. I also took 2 readings to figure out/notice that Scout was a girl - the few references to Jem's "sister" I took to be about someone who wasn't in the house right now, or something.