The subtle (and not-so-subtle) differences in the original (assuming the subtitles are accurate) and the U.S. version are interesting. Like this exchange between Wildstar (Kodai) and Venture (Shima) just after they crash their interceptor in Episode 1:
Kodai: Hey Shima, you alright?
Shima: Why don't you worry about yourself?
Kodai: What a pity, even if it's just one unit, I wanted to gun it down myself!
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Wildstar: Are you alright Venture?
Venture: Yeah, I think so. What about you?
Wildstar: What lousy luck. If this bucket of bolts had just held together another minute...
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Shima's not too interested in Kodai's concern is he? Plus, Kodai's regret over not downing the spy plane is a bit sharper than Wildstar's.
In addition, Wildstar/Kodai's brother's death is cast completely differently in the two versions. In Star Blazers, he sacrifices himself to protect Avatar's retreat. In Space Battleship Yamato, he refuses to retreat because he'd rather die taking as many enemy as he can down with him.