Yes
Yes, definitely people should listen more often to the original version. The original changes fit perfectly with the melody. I've posted a while ago the original version in this thread. Real book versions are often simplified for players to quickly sight-read. But there are lots of passing chords that are omitted and that have contributed for the song to become a hit in the first place. As for the Bm7b5 and Bb13 at the end, yes, those are the correct chords (more precisely B-9b5 Bb13(#11). Changing the Bb13 to E7, it's just a tritone substitution though. It's basically the same chord. Just the bass note is different. It all depends of how you voice the chord. If using an E7, I would rather play it like a E7(#11) instead of E7b9. The b9 definitely can clash with the high note E of the melody.