Other mistake: When the bear falls on Eddie, they are facing the same direction, but Eddie says that he knows the bear is a girl "Because its vagina is on my ear."
Other mistake: Father Amor picks up an ancient book, opens it, and blows dust from the first page. How did the dust get into a closed book?
Other mistake: When Sam and Tara first meet Gale outside, after Gale gets punched, pay attention to the multiple news crews behind her as they start arguing about Gale's book. Randomly, they go from paying attention and recording to suddenly all dispersing and packing up after the shot cuts to Sam and then back to Gale. This makes absolutely no sense. They're all involved in a very famous case; there's no reason every reporter there would suddenly start packing up in the five seconds they were offscreen.
Other mistake: The Pit Viper John gets given has a 21 round magazine. When he's drifting around the bad guys at the Arc de Triomphe shooting at them, he fires more than that, without reloading.
Other mistake: At first, Ethan tries to board the train by waiting until it slows for a sharp bend. Thanks to The Entity, the train is going pretty much full speed throughout, but doesn't derail or tip at the lower speed sections. In fact, the diners are all blissfully unaware that this is, in effect, a runaway train as they consume their canapés and fois gras, with soft music playing in the background.
Other mistake: After the first guard at the chemical plant is sniped, the second guard goes to check on him and is surprised by the sudden appearance of an attacking helicopter. Helicopters are extremely loud, and flying as low as it was depicted would also vibrate the ground and the building. There's no way it would have been able to sneak up on the guard like that.
Other mistake: Just when the tower clears 119 to take off, it shows the PFD and MFD screens. On PFD it shows air speed 250 knots and altitude 40000 feet which could only be happened when cruising in air. Also, on MFD it shows ground speed 250, and no flight path displayed. (00:09:00)
Other mistake: Halfway through the film, a cityscape with the subtitle "Russia" is shown - the city is, in fact, Atlanta. Skyscrapers such as the SunTree Plaza, Westin Peachtree Plaza, and the Georgia-Pacific Tower are visible. (01:24:00)
Other mistake: Boyd calls an office in Rome, Inspector Lavazzi. Lavazzi is not in his office, so another officer, Valeria, answers the phone, saying a few lines in Italian (in the rest of the movie, she speaks English with Lavazzi). Shyann Yan is not a native speaker, which would be fine given her ethnicity, but she is also not a competent one. Surely, she is not competent enough to be an officer in Italy. (01:04:00)
Other mistake: The window looks closed, but even if the window is open, the woman ironing in her house across the parking lot would not be able to hear Jay and Maggie's argument from that distance, only muffled voices at best. (00:05:18 - 00:06:11)
Other mistake: The sun is shining and the road isn't wet, but a shot of the windshield when Paul turns his head toward the backseat shows short diagonal lines covering the windshield. The image suggests but does not resemble rainfall. In front views, the windshield is clear. (00:09:48)
Other mistake: All the websites, both in the address bar and the results of the search, have no top-level domain like .com or .org. Everything is just www.something instead of www.something.com. (00:10:30)