When the skateboarding Josh runs into Ana, his dog Bosco is not pictured anywhere nearby until the mean girls arrive, then Bosco miraculously appears. Bosco continues to be oddly missing in key scenes.
When Ana visits Josh in his tree house and spills water on the medallion, the medallion is then dry when she picks it off the ground.
When Josh is walking over the stones toward Ana, his proximity to her changes multiple times.
The artifact Bosco finds is at least an inch thick and at least six inches in diameter. This is an exaggerated Hollywood interpretation of any possible ancient medallion, ridiculously oversized.
In the 29th minute, there is no way two children would have been able to move the boulder that they did.
One could not lift conquistador armour and helmet with a skeleton inside, without the skull (now detached from the spine) falling loose.
Early on, the sheriff's epaulets are lacking any insignia, and on the front of his uniform is only a tiny badge.
Set in California where both front and rear license plates are required on vehicles, several vehicles have no front plate.
In the 51st minute Josh reads a letter and says 'conquistor' or 'conkeester' instead of 'conquistador.'
In the 30th minute Josh says 'shoosh kebab.' The might be a poetic license for a child to mispronounce the term, but if not, then it should be shish (or 'sheesh') kebab.