Continuity mistake: When Martha walks up on Spencer at the creek he says he's filling the canteens with water (he has one in each hand), then when they start talking about liking each other, the canteens have disappeared.
Continuity mistake: The father of Alex is wearing a red scarf in the shot where Spencer and fridge are in front of his house. From another angle when Bethany and her mom see them from the car he's not wearing the red scarf.
Suggested correction: Mr Vreeke shows up speaking to Spencer without a scarf, when it shows him through Bethany's mom's car window, he is wearing one. It goes back to him and Spencer and the scarf is gone again.
Continuity mistake: At the end of the movie, Spencer is wearing a blue hood jacket when arriving at school. However, when they destroy the gaming unit and game with a bowling ball, Spencer is back in his yellow raincoat. Bethany and Fridge are also wearing different jackets, because outside Fridge is on a vest with a hoodie and a green shirt, and Bethany has on a blue jacket, but inside, Fridge just has on a hoodie and a numbered football shirt, and Bethany has on a multi colored jacket. Also, Spencer has on a black shirt outside, and a blue button down shirt inside. (01:48:00 - 01:50:00)
Continuity mistake: The rocket launcher pods are a bundle of PVC tubes on the prop but correct in CGI shots.
Continuity mistake: When Bethany is taking a selfie, there is a cup on the table to her left, which she adjusts. Throughout the entire sequence of the selfie scene, the handle of the cup can be seen to change directions several times, from pointing straight up (to the top of the screen from viewers perspective) to pointing to the left of the screen. This is noticeable in close up and far shots of the table, as well as overhead shots of the table. (00:04:35)
Continuity mistake: When Mouse Finbar returns from blowing up after eating cake, he lands in a pile of items at the bazaar. A book shelf falls on top of him and one side of the shelf falls off. In the next shot from a different angle the book shelf is in one piece. (00:49:20)
Continuity mistake: When Martha approaches the men at the transportation shed, the stereo is visible on the bench on the right and its front is parallel to the side of the bench, but when it switches on for the dance fight, it is now at about a 30 degree angle, touching both sides of the bench. (01:10:30 - 01:12:00)
Continuity mistake: When they get to the bazaar, Bethany is hungry and grabs something to eat. She thinks it's bread, but it's cake. When Mouse Finbar takes a bite and realises its cake, as he talks to Bethany, the shots go back and forth and Finbar has a mouth full of food, then he doesn't, then he does, etc.
Continuity mistake: Bethany, (in Shelly Oberon's body) has brown hair, but in the scene they save Alex from dying, their hair is blonde, maybe longer.
Continuity mistake: At the end when Bethany is walking with Spencer and Fridge, her hair is in front of her shoulder, then behind her shoulder, then in front again and when Spencer is talking to Martha face to face at the end, from scene to scene, his hair is different.
Continuity mistake: When Alex leads them to the tunnel, they keep the same line up - Martha, Betheny, Fridge, Spencer. When it comes time to walk across on the plank, now Bethany is at the end behind Spencer.
Continuity mistake: Towards the end when the group of 5 are getting ready to go down the lit path to return the jewel, Spencer tells Fridge to hand him the jewel, then when he starts the climb through the trees the jewel disappears. When he falls out of the tree and 'dies', then runs back to his friends, Alex asks if he has the jewel and he takes it out of his pocket, then the very next scene puts his hands on his hips and the jewel is gone again.
Continuity mistake: At the end of the movie when Alex sees his 4 'game' friends, he approaches them with his child in a car seat in his left hand. After he introduces his son and as he is talking to Bethany, the child in the car seat is in his right hand.
Continuity mistake: When the bad guys on the motor bikes are chasing the 4 players and they get to the cliff, the sun changes between shots.