Continuity mistake: Wick takes the lapel pin off and places it in his right front jacket pocket. Shortly afterwards he takes it out of his front left jacket pocket. (00:49:10 - 00:56:20)
Continuity mistake: Byron walks towards the maid and surrounds her waist with his arm. From the angle behind, he is repeating all previous movements.
Continuity mistake: When Letty places the necklace on Dom, the actual cross is almost touching the neckline of his top. When the shot changes, the cross is much lower down the chest. (00:15:05)
Continuity mistake: The scenery view shots near the beginning of the movie apparently are not meant to represent the passage of time (such as "one year later"), so the various changes in foliage - from green leaves (Summer) to leafless trees (Winter) to orange leaves (Autumn) to green leaves (Summer) and back to Fall foliage - do not make sense. This inconsistent foliage continues into the movie. (00:05:30 - 00:06:34)
Continuity mistake: When Nick and Audrey arrive on the island, you see Nick holding Audrey's bag. But later on in their room, the photo shows Audrey holding the bag. (00:06:50 - 00:11:36)
Continuity mistake: In the hospital, Sebastian's head is centered on the pillow. When the camera shifts, the top of the pillow to the right of his face is angled too low towards the upper-right of the screen. (00:02:26 - 00:02:51)
Continuity mistake: The dad is given a face tattoo on his right cheek just before going down the alley to be attacked. He is driving in his car, and the tattoo is gone.
Continuity mistake: At the bar, the amount of beer in Maria's "Corona Extra" bottle varies from at the neckline, to below, to above. After she takes a swig, it is still at the neckline; then it is about 1/2" above the neckline. (00:25:50 - 00:26:44)
Continuity mistake: When the first police officer looks at the body, Maggie's long hair is down her back, but is not when an officer takes a photo. (00:01:38 - 00:02:33)
Continuity mistake: While Lucky does push-ups on the floor, the positions of the pack of cigarettes and lighter on the coffee table change. In the side view, the cigarette pack goes from partially behind the glass to a couple of inches to the right, and the lighter goes from mostly to the right of the cigarettes to behind the pack. (00:42:08)
Continuity mistake: Kristin's suitcases are the same height and appear to be identical sizes, but one is smaller when she gets to Italy and has them stacked on a cart. (00:10:32 - 00:11:00)
Continuity mistake: When Robert is sitting at the café in the evening, the young man brings him a tea order. Robert prepares and puts out his napkins twice, from 2 different angles. (00:45:33)
Continuity mistake: They say Eden's former partner died in a diving accident in Barbados. Later in the movie, they are looking at statements from witnesses to the drowning from Bermuda.
Continuity mistake: Sitting on a bench in Campiello dei Miracoli, Ariadne Oliver shows Poirot a series of newspaper clippings about the mysterious medium Mrs. Reynolds. Tina Fey's thumb is placed in a different position on the page in the various shots.