Continuity mistake: When we see Serena for the 1st time leaning against the column she is wearing high heeled black boots. Later when she is on the beach after Xander took Pandora's Box, she is wearing low square heeled boots.
Continuity mistake: When the gang bids a silent farewell to Xander, look at Nicks in his close-up; in the background, Tennyson Torch is turning around towards his right, but in his own close-up, Tennyson turns towards his left, and Becky is close to him while she was nowhere in sight before. (01:33:10)
Continuity mistake: In Detroit, Serena tells Xander the story of how she was enrolled in the XXX program. She just mentioned Gibbons' quote about the lion. The wind rustles strong through Deepika Padukone's large mane in a reaction shot on a probably very envious Vin Diesel, but in the next shot her hair is suddenly still again. (01:03:35)
Continuity mistake: In the sequence when Adele Wolff disentangles herself from the makeshift harness she suspended herself in, the stunt double who spins around has much less fabric taped around her thighs compared to Ruby Rose's getup, and when it's Ruby Rose again shooting baddies close to the ground her richer double thigh draping is back. (00:54:50)
Continuity mistake: XXX is bargaining with the guy at the docks of the hideout in the Caramoan Islands. The guy says "30% off the top" and pulls a lollipop out of his mouth. He is not putting it back even in the following reverse shot when Vin Diesel laughs at him, but there he is after that, with the lolli again in his mouth. Similarly, when Diesel says "Aaaall right, 22 and a half" the guy has his lollipop between the lips, but it's gone in the next shot. (00:39:55)
Continuity mistake: Cage and his group dock at the island in the Philippines and he begins to talk with the guy who asks him what do they want. He begins; "I heard this is a perfect place..." and a girl walks across, leans against the table with the others and puts her drink down. Next shot, the girl is drinking from the same glass she just put down. (00:39:25)
Revealing mistake: The DJ dude is trying on the super gloves, but loses control and punches a hole in a hatch. Before the shot changes and we get to a close-up of the hole in the metal, you can see Kris Wu pull his arm back and the not-so-metallic parts of the door being pulled back, caught in the denim of his jacket like carton or foil. (00:38:00)