It’s not a huge difference but it’s an interesting one. The Spanish poster for I Am Legend has a very similar design to the main domestic poster, but instead of having Will Smith and the dog walking with the destroyed Brooklyn Bridge on the background we have them walking with a fairly generic looking New York street on the background.
The I Am legend marketing has been unusually careful to cater to international audiences. You’ll probably remember the banners depicting several cities from around the world destroyed by the plague. So this could be another example of that, with the bridge being substituted because it isn’t such a well known landmark in Spain.
Then again I get the feeling that, due to years and years of movies depicting it, the bridge is pretty much known all over, so perhaps they just thought the city background made for a better image.
If that was the case, I disagree with them. The domestic poster strikes me as being more impactful, and a more harmonious image to boot.
(Thanks to reader Casty The Clown for the Spanish version)