3. In the beginning scene, Honey Bunny says "Any of you f***ing pricks move, and I'll execute every motherf***ing last one of ya.", but in the final scene, she says it differently: "Any of you f***ing pricks move, and I'll execute every one of ya motherf***ers."
That makes alot of sense, actually, they are being shown not so much through different people's eyes, but they are being told based on diffrent people's perceptions. The very beginning of the movie, there is no clear perception, but at the end, it is from the point of view of Vinny and Samuel L. Jackson's character. (Whose name escapes me at this very moment...)
It's definately on purpose, Quentin Tarantino is too good of a director to allow something that obvious and stupid. I think that he most likely did it, as was mentioned several times previously, to show that it was through the eyes of Honeybunny and Pumpkin, while through the eyes of Vincent and Jules the second time.
This is obviously done on purpose, because her line at the end sounded something Jules would say, so the last scene was probably told from Jules's point of view. And plus, why would he film the same scene twice if were to be identical in the first scene and the last scene. So obviously it was done on purpose.