Video breakdown by BetaM.
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This trailer, released on May 25th 2004, was spliced together with early gameplay footage, videos of a later build than that one, and demo footage.
The breakdown focuses on this video alone, so differences covered in the early gameplay footage will be skipped.
General
The game at this point had voice acting, proper sound effects and music - all of which are heard in the video.
However, the music made for the trailer was not made by Spiralmouth.
The HUD still uses the CNK font, however proper icons were added.
Screen centering options were added, as evidenced by the footage shuffling around in position in a frame comparison.
Cortex's firing animations are missing facial animations.
N.Sanity Island
The beach has more structures than before, but it's still missing many objects.
The object layout is much closer to final, however the platform with the gem is missing here.
Getting gems doesn't have a HUD animation.
Iceberg Lab
Ice Climb has many more objects, however it's still missing wumpa fruit, gems and crates.
There is a checkpoint crate right outside Uka's arena.
This is likely the only exit from the arena as seen in the early gameplay footage.
This appears to be the beginning of Slip Slide Icecapades judging by the open air metal structures in the distance.
The chunk seems to turn sharply left, making it unlike any seen in the game.
Instead of huge floating machines, the slide switches are big signs with a red target on them.
Academy of Evil
This kind of zig-zaggy corridor doesn't exist in Cortex's section of Classroom Chaos in the final game.
An early version of Boiler Room Doom was shown, with a different artstyle than final.
This part appears to be the beginning of the second-to-last puzzle in the final game.
This shot covers a corner pipe catcher, likely in the first valve puzzle.
Interestingly, this short part contains the Travellers Tales watermark. It may be connected to the full source of the Gone a Bit Coco footage .
Junction corridors appear mid-level instead of just at the start and end.
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