The time frame of the story was was established as being in the off-season for diving in the Andaman Sea, which is mid-May to the end of July, but Bishop is seen reading a newspaper in Sydney which was published on December 1, 2014.
When Gina first makes an appearance asking for medical supplies she has bruise marks on the back of her left arm. Later that night after getting rescued Mei approaches Gina to treat her Injury on the right side of her back. Large bruise marks can be clearly seen. The following day Gina is on the beach in a bikini and none of the bruise marks can be seen anywhere.
When Jessica Alba arrives on the beach she has a cut on the bottom left side of her lip. The cut appears and disappears. While lying on the beach in her swim suit it's missing but when they both arrive at the club house it's back again.
Early in the film, Bishop gives his father's watch to Gina as a remembrance of him and his promise to return and rescue her. Throughout most of the film after that, he does not have the watch on his wrist until there are underwater scenes and shots of him trying to sneak on board Crane's boat near the end. The watch is plainly visible since his forearm is in the foreground.
After Bishop has a video call with Gina following his first kill for Crain, Crain takes a pair of handcuffs off Gina's wrists. However, in brief shot just before the video call, Gina was not handcuffed. Her arms were arms were on either side of her, not bound together.
When Bishop places the pack of cigarettes, gum and tin of shark repellent down at the prison checkpoint, the tin changes position from the left-hand page of the guard's book, to the right side, and back again between shots. Strangely the guard searches scrutinizes the cigarettes and gum, but never touches or opens the tin.
Bishop (Jason Statham) meets Mei (Michelle Yeoh) on an island called Koh Yao Yai near Phuket in the Phang Nga Bay; not Koh Lipe as stated in the movie. Koh Lipe is actually located far to the south of Andaman Sea near Langkawi Island in Malaysia.
About 42 minutes into the movie we see Bishop playing what appears to be chess. It's a little hard to tell because the pieces are hand-carved and the board is cardboard and magic marker. Chess boards are 8 squares high by 8 squares wide. The board they are playing on is 9x9.
At 23:10 Bishop points out a boat on the water watching them. Gina asks "where?" Bishop replies , "Two men in a Zodiak, out on the ocean." In the shot where he spots them with binoculars at 22:40 there are three people in the boat, which is not a Zodiak. The Zodiak is a rubber boat with twin inflatable pontoons. The men are in a Bayliner-style fiberglass hull boat.
At the end of the film, Gina is rescued immediately after she escapes the yacht. She is then shown being loaded into an ambulance at some docks while the wreckage of the yacht is being offloaded as well. Unless her rescuer wandered around the ocean for many hours, if not days, there is no way a salvage ship could be sent out to the yacht, pick up the pieces and return to the docks at the same time that Gina does.
When he's getting the brief for the Sydney job he's told "In downtown Sydney, atop a 58 storey high rise ...", but when Crain listens to the news article afterward it says "Billionaire Adrian Cook plunged 76 floors ...."
How did the building suddenly gain an extra 18 floors?