Plot hole: Sea-Plane tells the group that he has tried twice to cross the canyon and complete the transportation level. It would have made no sense for him to be completing that level moving toward the jaguar if he didn't have the jewel needed to finish the game. Either he had been given a jewel and it was reset back and given to the new players or there could be more than one jewel in the game but he doesn't mention having his own jewel.
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.
Continuity mistake: The rocket launcher pods are a bundle of PVC tubes on the prop but correct in CGI shots.
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.
Factual error: When Alex gets bitten by a mosquito (one of his weaknesses) and Bethany saves him. They venture off into the jungle to find the statue, so there was only 1 mosquito in the jungle? A jungle is full of mosquitos.
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.
Other mistake: Towards the end of the movie when Spencer is riding the motorcycle to the top of the jaguar statue, he throws the grappling hook and swings on the rope. When Martha hands him the jewel as she falls, the rope he was swinging on disappears.
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.
Character mistake: When Alex Vreek's father wakes him up to show him the board game, he knocks on the door and yells Tim or Jim, not Alex.
Suggested correction: He says "Hey, kiddo."
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.