This extends to the theme song, originally done with just one person, who still performs in it, which effectively drew every single major anison singer or group into one single project. There's several ending themes purely so every single one of them can get a chance to do a solo piece for it.
This was one of the few times that JAM Project did a collaborative project with all of their members, both past and present, working on the same thing, they had so many singers.
Artistic License – History: The Yamato is shown as a complete shipwreck when it is seen lying on the dried up Pacific floor, with most of its exterior fittings still attached. In real life, she suffered a catastrophic internal explosion during Operation Ten-Go and lies in two pieces with most of her superstructure scattered, in thousands of pieces, around the surrounding seafloor.
Averted in this series—the rusty shipwreck we see, in 2199, is a disguising shell, not a salvaged wreck (though portions of the actual Yamato might have been salvaged for construction purpose). Not surprising, since the incarnation of the space battleship is, by dimensions, too big for the original oceangoing warship.