Factual error: In the diner, the kids listen to/dance to Britney Spears' "Toxic," which didn't release as a single until January 2004. This takes place in 2003.
Factual error: After the naval battle, Thraex is waiting for an informant who tips him off about Lucilla and Marcus Acacius's plans. And of course, as a well-educated gentleman of 200 AD, he kills time by reading the newspaper. Wait, what? Needless to say (to anyone but Ridley Scott, probably), ancient Romans wouldn't/couldn't exactly get their news by newspaper, the press having not been invented yet. This one looks so modern in its layout it even has headlines and a proper publication title, "Roma Viridia."
Factual error: The movie, by various accounts, takes place 300 years after the apes took over and humans were rendered "dumb" (both literally and in the (non-PC), mute meaning of the word) or went underground. But yet they're making contact with a communication satellite. Satellites don't function for 300 years; they require occasional course corrections to keep from entering the atmosphere and burning up. Course corrections require propellant. The propellant wouldn't last 300 years. And the electronics.
Continuity mistake: When Jessica kills the sniper with the rock at the beginning, the sniper's body is lying dead on the ridge. When she shuffles down the dune to speak to Paul, mere seconds later, the sniper's body is no longer there. (00:09:04)
Revealing mistake: When Elly is "skating" on the black oil while fighting the bad guys, we can see that it is Bryce Dallas Howard's stunt double in a few shots where it briefly shows her face.
Continuity mistake: When Deadpool is talking to Wolverine's skeleton, in one shot the skeleton's mouth is closed, but in the next shot it is open.
Plot hole: Robotnik and Grandpa Robotnik are dancing through lasers. The suits reflect lasers, but their heads are completely exposed.
Suggested correction: Gerald notes that the lasers are specifically conforming to the shape of his body, and Robotnik explains that the suits were designed to create a field that specifically attracts/distorts the lasers.
Factual error: The insignia on Staff Sgt. Branson's uniform is incorrect. The insignia on her camouflage blouse is for a US Army Staff Sgt, not a US Air Force Staff Sgt. (00:03:58)
Continuity mistake: After the bad biker bites Noel, he removes the rearview mirror from the windshield and smacks the bad biker with it. However, when Noel tells Katie to drive the car, in the exterior shots as she sideswipes another car, the rearview mirror is back up on the windshield; then it's off again. (00:33:35)
Plot hole: Given contestants were carefully checked for steroids at show time, mainly by urine tests, it seems unlikely Jackie would have been allowed to compete once her steroid use was discovered.
Suggested correction: Not at the amateur level, and not during the time period depicted in the movie.
Continuity mistake: When Eddie and Martin meet for the first time in the woods and they are having a conversation, Rhys Ifans wears his necklace with the pendant above his clothes in the majority of the shots, except the ones when the camera is focused on Tom Hardy and he is facing left. In those shots, the pendant is under the T-shirt.
Character mistake: Characters frequently refer to there being crocodiles living in the water. Alligators live in Florida, not crocodiles. And although they are closely related, they are not the same species.
Continuity mistake: When Marcus is in the car, his grip on the phone changes between shots: sometimes he holds it with all his hand, but at other times just with his thumb and index finger. (00:14:58)
Character mistake: When Axel is being arrested by the female officers, he says he's been a cop for "thirty years, and black for longer than that." Axel has been a cop for at least 40 years; the first film took place in 1984.
Continuity mistake: In the staff room of the toy store, Callum gives Jack his Monopoly box to hold. The box does a 180° spin between shots, twice.
Factual error: The President and Agent Miles commandeer a small plane at an Astovian airfield to fly to Ramstein U.S. Air Force Base. Miles identifies the craft as Air Force One, as the President is on board. However, "Air Force One" is the designation only for Air Force planes that fly the President (similar to how "Marine One" is called that because it is a Marine helicopter). Non-military planes, such as the one they are flying, typically carry the call sign "Executive One" when the President is on board.
Continuity mistake: When Clay fights Anisette at the gas station, her heels change from stilettos to flats. Best visible when Clay throws her on a car, right after she says he should be retired.
Continuity mistake: At the gas station, Thelma and Ben are talking to random people Thelma thinks she knows. Meanwhile, her family is on the way there. The sun is going down in this sequence and it's noticeably getting darker. Before they run behind the building, it's suddenly lighter outside and gets darker again.
Character mistake: Zhen tells Mr. Ping and Li that at least they didn't lie to Po, and Mr. Ping says that it's true. It's actually not true, because Mr. Ping lied about the secret ingredient in his soup and Li lied about knowing Chi.