Factual error: The main apartment in the show is located in Pasadena, Calif. When looking out the window in the background, mountains are shown in the distance and far away. In reality, Pasadena lies right underneath the long mountain range so the mountains would be up close, not far away.
Factual error: When Raj, Howard and Bernadette are in the car, Raj puts on Batman the Animated Series to distract Howard from his back pain. Howard says "I'm in too much pain to watch cartoo-oh, this is a good one!" However, there is no way he could know that it's a good episode of the show because the opening theme song can be heard playing and the name of the episode does not appear until after it.
Visible crew/equipment: When Leonard, Sheldon and Penny are eating lunch for the first time, Penny sits on Sheldon's spot, Leonard then tells him to "Just sit somewhere else." He then walks over to his desk chair and contemplates sitting there and in the bottom left of the shot there is a chair with 4 false legs, and one large leg running down the middle.