Continuity mistake: Series 1, Episode 9: Primal. As Carter and Taggart are crawling through the access tunnel, the torch attached to the side of Taggart's goggles is pointing downwards, below his line of vision as established by the lenses on the front. As the shot changes to a close-up on Taggart, the torch is now pointing forwards, aligned with the lenses.
Factual error: Henry Deacon says people only use 10% of their brain at any one time. That's complete garbage - at times we may use quite a small part of our brains, other times the whole brain lights up with activity. The "10%" myth has absolutely no basis in fact - no-one even seems to know where this figure came from! Given the intelligence of Eureka's residents, Henry (and indeed others in the room) would know this.
Add timeJon Sandys
Other mistake: When the parents freak out about Brian being missing, the back of the camper is shown, as is the part of the camper that's missing due to the distortion sphere. But it doesn't make sense; there are some parts of of the camper that shouldn't be there, mainly the one piece above the ground, where the sphere scorched the pavement but left the camper's end right above it completely intact.