BETTY. (Having noticed something in the woodbin.) Well, would you look at this.I would guess that Shue wrote the dialogue this way in order to better emulate real conversation which is often peppered with overlapping interjections. As an actor, trying to memorize these interjections is difficult because they cannot be properly queued off of. This results in a tendency to jump lines and miss entire passages of actual conversation.
BETTY. Two of 'em, this time. That boy.
BETTY. It's that dumb little Ellard Simms, looky here. He takes one o' my apples, bites out of it, then decides he don't want it, and dumps it in here.
FROGGY. Oh, yes.
My own personal solution to this is to memorize my lines in blocks and to end each block at points where Froggy Leseur is supposed to fumble with interjections. Also, I've noticed that Shue tends to write his interjections in threes, which makes them a little easier to memorize.