Because it would have been too difficult to recreate visually. We shot that entire video in one day, just the two of us. We made all the props and had no camera man. We were out in that field at like 2am finishing up the fireworks shots.
The whole "fireworks exploding in the truckbed" was going to be too much to pull off.
So, it forever lives on as a special treat in the extended version.
I just thought of this question a few days ago when I saw the video again. Then I decided to look back at really old questions, and sure enough, here's my answer!