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The Big Bang Theory

The Herb Garden Germination - S4-E20

Revealing mistake: When Sheldon is web chatting with Amy, we can hear Amy talking, yet the bar at the top of Sheldon's computer screen indicates that the sound is off.

The Hot Troll Deviation - S4-E4

Factual error: During the final scene of this episode, Sheldon steps out of his office wearing a gas mask and engages Leonard in conversation where he then states he is making hydrogen sulphide gas (more commonly known as H2S). Leonard correctly identifies this as highly flammable. However, this gas is far more dangerous and is harmful to the human body at as low a concentration as 20 parts per million (ppm), can cause permanent damage at 100ppm and is fatal after two breaths at 500ppm. So for Raj (and his bird) to be completely unharmed in a high concentration of H2S (noted by the fire) is impossible.

The Boyfriend Complexity - S4-E9

Continuity mistake: In 2-15 "The Maternal Capacitance" Penny explains to Beverly, referring to her father, "My mom could have just said 'Bob, get over it, she's a girl'". But in this episode Penny's father is named Wyatt.

The Zazzy Substitution - S4-E3

Factual error: The proposition that danishes wouldn't exist if Kopenhagen were flooded is wrong, because danishes were invented in Vienna. They are called danish in English-speaking countries because they're very popular in Denmark. The Danish word for this pastry actually translates to "Viennese bread."

The Cohabitation Formulation - S4-E16

Continuity mistake: When Penny is pouring water into the glasses on the table after first meeting Raj's sister. The level of water in the pitcher changes between shots

The Cruciferous Vegetable Amplification - S4-E2

Character mistake: In the first scene, on Sheldon's board are the words "D-D Fushion." This should be fusion. Sheldon wouldn't make a mistake like that.

The Hot Troll Deviation - S4-E4

Continuity mistake: When Howard and Bernadette are talking in the Cheesecake Factory, her apron that she puts on the table is constantly changing position.

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.

The Irish Pub Formulation - S4-E6

Continuity mistake: As Raj, Howard and Sheldon are sitting at the table discussing leaving Priya alone while Leonard and Priya are away from the table, a water bottle sitting in front of Raj moves back and forth between his tray and Leonard's tray.

The Hot Troll Deviation - S4-E4

Continuity mistake: When George Takei and Katee leave Howard's bedroom, in one shot Howard is clasping his hands together, in an instant they are spread out completely. With no time to move them.

The Big Bang Theory mistake picture

The Robotic Manipulation - S4-E1

Continuity mistake: In the ER, the glasses around the nurse's neck move instantly without her touching them. They go from angled to straight instantly.

The Robotic Manipulation - S4-E1

Continuity mistake: When driving to the date, the cars behind Penny's change place instantly. For example a 4x4 becomes 3 cars, which becomes 1 car in the space of 3 seconds.

The Hot Troll Deviation - S4-E4

Continuity mistake: When Leonard and Howard are talking at the University, Leonard says "Oh my god you ran over a hobo!" when he does so Howard is not holding his fork, camera cuts and he suddenly has his fork in his hand.

The Robotic Manipulation - S4-E1

Continuity mistake: At the start, as Howard says "And finally my kung pow chicken" the robot arm is level with the top of the bag. Camera cuts and it's reaching to the bottom of the bag.

The Herb Garden Germination - S4-E20

Other mistake: When Sheldon and Leonard are playing Archery on Wii Sports Resort, Sheldon presses the Z button on the nunchuck controller to fire the arrow, which is incorrect. When Leonard plays, he holds the Z button as he prepares to fire, then releases the Z button to fire, which is the correct controls.

The Zarnecki Incursion - S4-E19

Plot hole: While it would certainly destroy the entire plot of the episode, Sheldon could have simply contacted Blizzard's customer support to get all his stuff back.

The Hot Troll Deviation - S4-E4

Continuity mistake: When Sheldon and Raj are arguing about having a desk in Sheldon's office, Sheldon's bottle of water keeps rotating without anyone touching it - take note of the label. The level of water in Sheldon's drink also keeps changing between shots.

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Sheldon: At this point, I should inform you that I intend to form my own team and destroy the very bonds that bind your very matter together and reduce the resulting particulate chaos to tears!
Leonard: Thanks for the heads up.
Sheldon: You're welcome. [Turns to leave.] One more thing,
Leonard: Yes?
Sheldon: It's on, bitch.



After Sheldon mentions a molecular sieve, they go over to 4a, their apartment. 4a is a kind of molecular sieve.