Did the old army guy die? I wasn't sure. There were no fatalities in the other two Sonic movies, right? But this had a confirmed human fatality and we see how that person actually died, geez.
I'm saying no. While it was left ambiguous, it was mentioned that Commander Walters/GUN Commander was rushed to the hospital and when someone disguised as him showed up, his subordinate didn't have a "I thought you were dead!!!" reaction. On a meta note, it got mentioned that script writers originally planned to kill
Tom and backed off due to tone so I don't think GUN Commander is dead. However, they may not have him return for the next movie and could use this injury as why.
There's suppose to be a bio lizard on the satellite? And... Chao being a major thing? And Chaos as blob bosses? Chao got referenced in the theme park but no reference to the Chaos blobs or lizard thing?
The third movie did a good job of distilling and compacting story elements down for a different medium and continuity. Since the first Sonic Adventure wasn't adapted to the movies, major elements from it like Chaos and the Chao aren't in the movie outside of what amounts to an easter egg with the Chao Garden. The blob creatures in SA2 are "Artificial Chaos" but don't need to be in the movie due to the lack of Chaos or the Biolizard.
The Biolizard is a good example of plot changes requiring big deviations. The movie never overtly declares Maria as being terminally ill like in the games. In games, Professor Gerald creates Shadow with alien assistance in attempt to cure Maria. The Biolizard is the failed first attempt at this. If Maria isn't sick and Shadow is an alien who was found rather than created, there was no reason to make the Biolizard part of the movie.
Really good action movie. Could have used more heart (since it's for kids) but I guess it's hard to emotionally resonate when the main emotional thing is suppose to be recovering from someone murdering your sister / close friend or father figure (for kids anyway).
See, I think the movie had plenty of heart. It's just that it comes from recovering from loss--a recurring theme through all three movies. Shadow and Maria was the most overtly on screen but Knuckles and Sonic also had to deal with loss of family.