Continuity mistake: Ilya is standing across from and about midway between Chris and Alicia. He spears the shovel into the ground, but it unintentionally falls over to his right (mostly off-screen). The next view of the shovel shows it has fallen to Ilya's left. (The entire shovel is to the right of Chris, which would be too far regardless of which direction the shovel's handle fell.) In the next view, the shovel's blade is opposite Chris' left foot and later the angle is different. (00:36:30)
Continuity mistake: Spoiler alert: About halfway through the movie, we see Emma Roberts coming out of the shower, and the camera focuses on the gunshot wound on her shoulder, with the round scar of the entry wound on her back, and the much rougher, ragged scar of the exit wound on her front. Then at the end of the movie, where it's revealed that Kiernan Shipka and Emma Roberts were actually playing the same character, just nine years apart, Kiernan Shipka gets shot by the police officer when he finds her in the room with the severed heads. Problem is: she was facing the officer. The scars on Emma Roberts are the wrong way around. (00:31:05 - 01:15:35)
Factual error: Throughout the film, the helmet plates worn by the London Policemen are the 1930's pattern with the George V cypher in the centre. In 1912/13 they would have repeated the officer's collar number in the centre. The helmets themselves are also British military pattern blue cloth helmets with Police fittings added, rather than the correct Police pattern ones.
Continuity mistake: The collision with the deer shattered the windshield in front of driver Ben, but when Ben skidded to a stop, there did not appear to be any damage to the driver's side windshield. When Ben and Carter were getting out of the car and when they were changing the front passenger side tire, the passenger-side windshield was shattered (and closer to the hood compared to midway between the hood and roof on the driver's side, which was no longer there). (00:10:20 - 00:11:04)
Factual error: A library assistant is showing his cellphone to a Fed. The Fed pulls out his gun and shoots the assistant from about 8 inches away into his left temple. Another Fed, standing to the immediate right of the assistant is shown after the shot. But there is no blood or material spray on him at all. His white shirt is immaculate. In fact, there is no blood anywhere.
Continuity mistake: The guys pass 3 women walking on the sidewalk just before the Ciel pulls up at the hotel to visit Travis. 2 of these women are in the next shot where Vinnie and Eric get out of the car and walk into the hotel. The tall one in a floral dress walks away from the camera and stands to one side, and the blonde wearing the black top and spotted shorts is chatting in the background. (01:06:05 - 01:06:55)
Continuity mistake: After the shooting at the concert, Lysistrata is in the bathroom downing the pill with some Don Julio tequila. The bottle lid is to the left of the bottle in the wide angles, to the right in close-up. (00:10:00)
Continuity mistake: After Liz and Bev tell Bill that they can't cancel the show, they are helping him put his suit jacket on. Dimitri behind him is using a sticky roller thing to get hairs off the jacket and is down on his back. After Bev mentions the weather issues the camera angle changes and suddenly Dimitri has the roller up on his shoulder.
Continuity mistake: At the very start of the movie as the 2 guys walk down the alley way, the one in the black jacket lifts his arm up as he passes the rubbish bin. In the next shot from the front both his arms are in his pockets and the rubbish bins completely disappear. (01:00:00 - 01:01:00)