Leonard Rossiter as the Russian
Seemed a bit of a strange choice to have a Brit play a Soviet Russian when BBC 12 (HAHA, they never got as far as that) Brits appeared in the movie, speaking to the main characters, but I did like the sense of tension between him and Floyd, hinting at the Cold War paranoia that came so close to world war in the 2010 sequel.
I mean, Leonard Rossiter was most famous (I believe) for Rising Damp, a sitcom about a very dodgy British landlord and how he clashed with his tenants regularly.