Well, I guess that shows what sub and special weapon were developed first. Interesting that this shows standard Splattershot with splat bombs and inkzooka while the final product doesn't have that combination.
That super jump marker on the player being jumped to is visible to everyone. I'm sure that would've been obnoxious and glad it was removed. The tag on the bottom left that is shown only to you is much cleaner in the final product.
Not shown in the video you posted but the original E3 reveal video has a lot of differences worth admiring as well like how massive saltspray rig was initially.
Yeah, I didn't post the link to that video because there is a (much older) thread about those differences, but I have been watching it from time to time lately, yearning for the opportunity just to play around on those beta stages. Saltspray was a floating labyrinth! Arowana had SO many areas not present in the final version, and was at least twice the size! (seriously, it really more like a mall.) There were two grate paths over top the ramps up to mid, mid was much larger, there were series Excitebike-esque ramps. And let's not forget that in Walleye, there were moving platforms hanging from the ceiling and you could swim on top of the sniper boxes. AND, in that video, they show an inkstrike that looks like a nuclear ****ing bomb hitting. O_O
All of these things would have made for a very wonky and unbalanced final product, to be sure, but the squid in me really wants to go woomy on these stages just to have more areas to explore, to see what could have been, etc. I've always had a fascination with these unfinished products in games; it gives insight to the thought process of the developers as they started out with one idea and it grows into something more full and detailed as production goes on and they see what things worked and what didn't. As well as the progression of their creative direction. Certainly they envisioned much larger maps than what they mostly settled on in the final version.
