Continuity mistake: At the fancy dinner at the beginning of the movie, Frida uses the titular line ("Blink twice if I am in danger") on Kyle MacLachlan. Rich slightly tips over his glasses as Slater waves his hand. In the next shot, Slater is still waving, but Rich's position is wildly different; his glasses are completely off and in fact below his waistline. (00:09:20)
Continuity mistake: Kraven casually sniffs a couple and ruins their relationship. He then sits down with his brother; Fred Hechinger's hand keeps changing position between shots, holding a fork or not.
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.
Continuity mistake: When Samira and Eric arrive at the jazz club, Eric sits Samira down and then goes outside. A drum kit can be seen with "East Harlem Best" written on the front. Right after he leaves and right before Samira stands up to plug her iPod in, a bar stool has suddenly appeared in front of the drum kit. Eric will move this same bar stool in front of the drum kit himself again later on in the scene.
Continuity mistake: In the kitchen scene at the beginning of the movie, the protagonist's pregnant wife jokes about him saying something "wildly inappropriate" to the judge to be exempted. In close-up, she has no hair running down the front of her left shoulder, as opposed to the rest of the scene.
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.
Continuity mistake: When Jack has his temperature taken near the start of the film, the thermometer in his mouth goes from right-side up to upside down, then back to right-side up between cuts.
Continuity mistake: Antonio visited his ex at his new educational centre. He confesses his hopes to his female friend, who tells him it's a bad idea. During this scene, Michela Giraud's hands change position noticeably between shots, sometimes during mid-sentence cuts. (00:24:00)
Continuity mistake: When Gus March-Phillips is being recruited, Gus helps himself to whisky then grabs some cigars from a cigar box. The cigar box is easily identifiable as a Fuente Fuente Opus X brand, made by Arturo Fuente. Opus X cigars were first produced in November 1995.
Continuity mistake: Sister Cecilia is lying on the medical bed as the pregnancy is discovered. Father Sal Tedeschi whispers, "He believes you," as the cardinal says that it's a miracle. Álvaro Morte's hand is touching Sydney Sweeney's veil. She does not move her head in the reverse angle, but when we get back to the previous, the hand of the padre is far more distant. (00:35:50)
Continuity mistake: Several times throughout the movie, Thelma's eyes appear to change colour.
Continuity mistake: When Axel introduces Serge, he places his hand next to his ear as if he were hard of hearing. From the opposite angle, his hand is lowered. As of then, the position of his hands is not continuous between shots.