In the opening scene, there is the word "Eigervalves" written on the white-board. This is a misspelling of Eigenvalues, though it is not clear whether or not it is intentional.
During the dance sequence at the end of the episode, the first time Raj sings "You are my heart" his mouth movements do not properly match what he is singing.
During the dance sequence, the shadow of the camera is visible multiple times at the bottom of the screen during close-up shots. When the camera tilts up, the lighting rig is briefly visible a few times in the top corners of the screen, as well as an undressed backstage part of the set behind Raj during close-ups of him.