Visible crew/equipment: In the scene where the knights are attacked by the killer rabbit outside the cave, you can see the boom mic at the top of the frame.
Continuity mistake: Near the end, Sam Clayton is nearing the finish. The audio leads you to believe that the horse is breathing VERY hard, but when the camera shows the horse, the nostrils are NOT flared as they would be on a horse that has been run to exhaustion (or even down the block). Also, the people filming this scene obviously have no clue about the nature of sweating in horses. They showed "lather" all through the horse's mane. The ONLY places horses will lather while sweating is where something is rubbing, i.e. underneath the saddle, the bridle or breast collar, where the reins rub on the neck or between their back legs.
Factual error: Bullets thrown (or spat) into a fire do not go off with a bang, and do not fly off and hit anything. The sound of a gunshot is produced by contained gases exploding out of the gun barrel. The casing of a bullet is far too weak to contain the gases, and would split as soon as the powder started to vaporise in the heat of the fire. You'd get a lot of smoke, a lot of fizz and pop, but no gunshot, and no bullets whizzing about.
Continuity mistake: When the RV leaves the holiday park after the group find Ginger killed, look at the back of the vehicle and you will see that the window that the mechanic repaired earlier is just covered with brown paper. It changes to a patched-up window later on in the movie.
Factual error: When the nannies hide in the blue whale's mouth they peer out between its teeth. A real blue whale has no teeth - it is a baleen whale and has plates of horn-like "whalebone" (baleen) instead.