- Tube3 was going to be Tube2's secret level. Tube2.j2l has it in its secret level field, and both Tube3.j2l and TUBE3.LEV have medivo1 as their next level.
- The TNT has trouble detecting the blocks the first time because it only explodes if it's directly overlapping a tile with a destructable scenery event. In the final, it was changed to check for such events in nearby tiles as well.
- While this is hardly an excuse, the messed up speakers would seem to be an artifact of JJ2's original resolution. Practically all the non-textured backgrounds are designed for screens 320 pixels wide, and so while the heights vary -- 8 tiles for Tubelectric, 6 for Dam Nation, 7 for Labrat and Inferno and Castle -- the widths are invariably 10 tiles (or 20 when flipped). When the resolutions got expanded, whoever was handling Tubelectric may have expanded the height to 8 tiles to fix the more obvious vertical tiling bug, but didn't bother to fix the horizontal tiling. Definitely something they could and should have fixed, but that's most probably where it came from.
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