I can't believe someone had to point this out to me...
Jack's out recording sounds and we hear an owl, frog, wind, etc, but he can't pick up where that "zip - click, zip - click" is coming from. I've seen this movie a dozen times and never figured out it was Burke's watch gadget.
So may good scenes and moments, too. I love the look jack gives the Ryan aid when he quickly says the girl has been take care of. Or when he tells the other guy he wasn't "bobbing for apples."