Benji Dunn: [showing a glove.] Now remember: blue is glue.
Ethan Hunt: And red?
Benji Dunn: Dead.
Early in the film, Ethan is talking with Jane in the back of the van after they have dropped off the Russian. There is a silver flexible arm lamp hanging down that is visible when the camera is on Jane, when the camera cuts to Ethan and back to Jane it is no longer visible. A few camera shots later and it has reappeared in the original location.
The language spoken in the video by Kurt Hendricks (in the IMF section of the train) is not Russian, despite the eagle and nametags in Russian, but Swedish, Mikael Nyqvist's (the actor portraying Kurt Hendricks) native language.