Continuity: The Loobenfeld Decay: Sheldon puts the bag in the bin at the start of the episode so that the handle's are facing the ground. When he gets the bag out, the handles are at the top of the bin.

Continuity: Series 1, Episode 17, 'The Tangerine Factor': Penny throws a black Ipod out the window but when Raj comes in he has a silver one. This is a mistake as it's explained that it is the one Penny threw out.

Revealing: Series 1, Episode 17, 'The Tangerine Factor': When Penny goes into Sheldon and Leonard's apartment, to throw the Ipod out the window, it is clear she doesn't actually throw the Ipod.

Continuity: In the episode "The Tangerine Factor," when Penny is squirting chocolate syrup in the ice cream container, she drizzles some on the lip of the carton, causing it to run down the outside. The camera switches to Leonard and then back to Penny, at which point, the chocolate is gone.

Audio problem: The Loobenfeld Decay: When Sheldon is knocking on Leonard's door at the start, the sound is out of sync with the action.