Continuity mistake: Vicky returns late to the hotel and talks with Stephanie; when she listens, mouth agape, at the news that Emily may have killed Sean, the hair on her shoulder shifts position. (00:50:05)
Continuity mistake: Hard-to-avoid mistake: in the shower scene, Henry Golding's hair on his forehead changes position constantly as he receives the killer's visit. (00:40:25)
Continuity mistake: When Stephanie meets Emily at the Tiberius Leap, she's wearing reddish-brown shoes, but during the sequence where she was stopped by the bodyguards, her shoes were matching part of her dress in a powder pink shade. (00:28:20 - 00:37:10)
Continuity mistake: Throughout the scene at the Tiberius Leap, the natural lighting changes several times. To avoid a flood of samey entries, just pay attention to the light on Anna Kendrick's body and the shadows Blake Lively casts on the parapet behind her. (00:37:00)
Continuity mistake: When 'Grandma' Margaret meets her grandson for the first time, a couple of shots from behind show her left hand raised in front of her mouth, which isn't the case in the reverse shots. (00:33:05)
Continuity mistake: When Margaret and her sister wave their hands in their opening scene, the natural lighting changes between shots. (00:31:45)
Continuity mistake: When Portia announces Emily's aunt and mother as her wedding gift, Dante scratches his chin in the wide shot but doesn't touch it in the other angles. (00:31:30)
Continuity mistake: The scene where Emily 'rescues' Stephanie from the two Bartolo henchmen has rather odd timing; Emily suddenly appears behind the two just in time, but she was actually the person Stephanie was filming, in a different spot of the banquet, and she was speaking with Matteo, whose arrival she treats like it's a surprise. (00:28:35)
Continuity mistake: In the reaction shot of Vicky squeaking at Nicky's comment about Stephanie and her father's past, the concierge staff member is walking towards the left in the background, but is stationary in the following shot. (00:23:05)
Continuity mistake: When Sean approaches his son—who is embracing his mother for the first time in five years—the position of the glass at the son's lips is inconsistent between shots. (00:22:50)
Continuity mistake: When the Mustang driven by Dante nearly crashes on a hairpin turn in Capri, the natural lighting changes during the scene, especially at the end when they get back in their vehicles. (00:21:45)
Continuity mistake: Upon landing in Campania, Dante has both hands behind Emily's back whenever a certain angle focused on Anna Kendrick is shown, even when their relative positions in other shots wouldn't allow it. (00:19:50)
Continuity mistake: At the airplane bar, Stephanie slides the martini glass away from herself with her left hand, which becomes her right hand at the cut. (00:15:35)
Continuity mistake: While Stephanie is at the airplane bar and Emily offers her a martini, the small group in the background around Vicky changes position between shots. (00:15:25)
Continuity mistake: On the private plane, Stephanie stands up saying, "Time to get eaten by the lion." In the cut to the next shot, Vicky behind her is in a completely different posture than just before; her left hand is raised, touching her face. (00:14:50)
Continuity mistake: As Stephanie makes her entrance in slow motion to the tune of 'You Don't Know Me,' watch the background; the taxi driver opens the trunk, but in the close-up of Anna Kendrick's hair blowing in the wind, the trunk is closed. (00:13:10)
Continuity mistake: When Stephanie is signing copies of her book, the woman she interacts with the most, named Bernice, is in different positions across various shots - her arms are either folded or not, and at first she is either peeking out from behind the man in front of her, or not. (00:10:50)
Continuity mistake: When Emily announces to the few attendees of the reading that the wedding will take place in Capri, Stephanie's ponytail is resting on her shoulder in the front shot, but down her back in the reverse shots. (00:10:10)
Continuity mistake: Emily asks Stephanie it's "maybe a little bit possible" that she's changed; from one shot to the next, she's first gesturing with one hand, then (at Stephanie's "no") her hands are together. (00:09:35)
Continuity mistake: Emily asks Stephanie to be her maid of honour, eliciting reactions from the crowd. One of the reaction shots is on a curly-haired woman wearing denim. Darren expresses out loud his perplexity; the camera cuts to him, and the woman is behind him, looking in the opposite direction from the previous shot. (00:09:20)
