Moose

The Adhesive Duck Deficiency - S3-E8

Character mistake: When Penny is telling Sheldon to sing "Soft Kitty" as a round, she (twice) tells him to come in after two bars. When he actually joins in, he comes in after one bar.

Moose ★

The Contractual Obligation Implementation - S6-E18

Factual error: At the end of the episode, the girls are at Disneyland in costume as Disney Princesses. Adults at Disneyland are not permitted to wear character costumes because of the risk of them masquerading as Cast Members, so they certainly would not have been dressed that way at Bibbidy Bobbidy Boutique.

Moose ★

The Agreement Dissection - S4-E21

Continuity mistake: When the girls take Sheldon out dancing, he mentions that he considers himself a proficient dancer due to his Cotillion training when he was a boy. But in S1E7 The Dumpling Paradox, when Leonard suggests that they could have gone dancing with the girls, Sheldon said that nobody in the group - including him - could dance.

Moose ★

The Hawking Excitation - S5-E21

Character mistake: The sign on Howard's laboratory door reads "RESTICTED area".

Moose ★

The Herb Garden Germination - S4-E20

Revealing mistake: Sheldon's laptop has gone through several strange transformations throughout the series, but in this episode it takes the biscuit - it appears to be a Dell XPS with the back covered up, but the shot of Sheldon chatting only to Amy shows a Mac keyboard, with the laptop running OS X.

Moose ★