The mainland Chinese release obscures Vanko's nationality by reversing all Russian references on the soundtrack. For example, the word "Russia" comes out as something like "Ashar", and "Siberia" as "Ayuribias". The subtitles and the Mandarin-dubbed version simply delete these references altogether.
The version of the film shows in AMC Theaters as part of a pre-Avengers Marvel Phase One marathon features an exclusive intro from Agent Coulson, talking about the film and the character. These Coulson intros were later includes as bonuses in the Avengers Phase One box set.
The version available through Hulu, Amazon Prime Video, and EPIX are all cropped to 1.78:1. This is odd, because all three of these services usually maintain the 2.39:1 ratio through letterbox, in order to keep the original picture information.