I think I've spotted a couple of mistakes, too.
If I remember correctly, and I might be wrong here, I think the Royal Navy maintains a presence on the Thames, or perhaps the estuary, specifically to knock down
any kind of unexpected aerial incursions in and around London. Or did I dream that? Well anyway, if it's true, the ending of Retaliation would be markedly different from what we saw at the cinema!
Also,

Cobra Commander's missiles from space were specified as not being 'launched' or 'fired' at a target; they're simply let go by their respective satellites, and gravity does the work. So when

Roadblock blows up the satellites, wouldn't the missiles already in the loading arm of each one just fall to Earth anyway? It's like in the first film; if the ice-pack stayed afloat with all that steel inside, breaking the ice and steel up into bite-size chunks, effectively making those pieces
smaller, wouldn't actually make them sink at all!
Anyway, these films are only meant for entertainment, (as sci-fi goes, they're light on science and heavy on fiction), and as I said before, when I'm watching them with the kids, we don't put the toys away and start scientifically analysing; we just have fun instead!
SPACE COMMANDER