Continuity mistake: 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.
Continuity mistake: After the sandstorm ends, there's a shot showing Ethan's back and the sand moves away. Ethan's shadow is behind him, meaning that the sun is in front of him, butwhen the shot changes to view his front, the shadow is in front of him, meaning that the sun is now behind him.
Continuity mistake: When Cobalt piggybacks IMF's frequency, he says "Team leader, awaiting your go sign. Standing by to detonate." When Sidorov plays the recording back to Ethan in the hospital, the order has changed to "Awaiting your go sign, team leader. Standing by to detonate."