Continuity: In the scene where Ethan is in the NOC list room Krieger starts to drop him and Ethan is hanging there for a little while. Suddenly some sweat starts to drip down his glasses and he catches the drop with his hand. If you look at how close he is to the floor this move would be impossible.

Factual error: Max@Job 3:14 is an illegal e-mail address.

Factual error: The train is a French  TGV, these do not operate in the UK (not to date anyway) The Channel Tunnel passenger train is the Eurostar.

Continuity: Besides the fact that during the final action sequence it is impossible for two trains to occupy the same tunnel, how is it that the blades of the helicopter attached to the first train don't strike the second? Tight fit.

Factual error: In the scene where the helicopter is being flown into the tunnel, sparks can be seen on the far tunnel wall, where the rotors have hit it. No helicopter can keep flying in a straight line after the rotors have collided with a solid object in this way.

Continuity: The train is electric, supplied by overhead cables, which do not appear to be present at any time. If it was a Eurostar then it could use 3rd rail pick-up but it wouldn't be going so fast, but that's academic; its not a Eurostar and no 3rd rail is visible either.

Continuity: At the end of the film, Ethan drops his mask. His hair looks flat and wet. At the next shot it's dry and up.

Continuity: When Ethan is being lowered into the room with the NOC List, he has the digital temperature gauge. As Ethan is going down, the gage is right side up so you can read it normally. However, Ethan is upside down, and therefore so are the camera glasses he is wearing. Now when we see the computer screen that Ving Rhames is using, the gauge is right side up there, but it should actually be upside down.

Plot hole: In the air vent, we see a rat. Wouldn't rats in the vents set off the alarms on a regular basis, because the lasers were on the upper side of the vent?

Continuity: When Tom goes to the restaurant to meet with Henry Czerny, the plants in the aquarium are noticeably different after he goes inside.

Factual error: CIA headquarters in Langley has its own firefighting unit and never, ever calls for outside help.

Continuity: During the Channel Tunnel helicopter chase sequence, the colour of the helicopter changes from red to black.

Factual error: The Channel Tunnel tracks run through separate tunnels, one going to France, one going to Britain, so trains don't pass in the tunnel as they do in the film.

Revealing: When Ethan uses the magnetic screwdriver to undo the screws holding the grille to the air-vent in the NOC list room, the spindle that is actually turning the screw is visible after it falls out.

Visible crew/equipment: When Ethan is going down to the security room on a rope you can see a man standing on the floor at the bottom. It's right after he starts to descend.

Continuity: At the end of the movie, when Ethan and Luther are sitting at the pub, just after the cheers/here's to you speech, Luther said "Hey, I'm flavour of the month" and brings his glass up to his lips for a drink. In a split second cut to a wide shot facing Luther his glass is on the table, and there are only two glasses on the table as established in a wide shot where Ethan says, "I'd better go catch my flight."

Other: The version of the Bible which Jim Phelps supposedly got from the Gideons at the Drake Hotel was a New International Version (NIV). The Gideons International distributes only the King James Version (KJV) or the New King James Version (NKJV).

Continuity: In the secure room, why didn't they just knock the guy out and tie him up? Then they wouldn't have had to worry about alarms at all! Claire wouldn't have even had to go inside and they wouldn't have needed all that computer technology. Ethan was hanging right over top of him and easily could have handled it. [They don't want to leave any trace that they were there, although the accidental (or deliberate?) knife drop ruined that plan]

Continuity: In the scene of the eurotunnel train the ticket collector is wearing a 70s British Rail uniform This was the national railway company for Great Britain but is now defunct due to privatisation in the 90s.

Factual error: The train is running on the right-hand track, but in the UK trains normally run on the left-hand side, same as cars on the roads.  In Europe and the US, trains run on the right-hand track.