A Math Emergency and Perky Palms - S2-E15
Continuity mistake: When talking to Mr Gilford, his arm is constantly on or off his walking stick, depending on the shots. (00:12:10)
A Nuclear Reactor and a Boy Called Lovey - S2-E13
Continuity mistake: When Georgie is writing a letter to Veronica, the handwriting changes drastically from when we first see it to when we see it a few seconds later. Note Veronica's name. (00:10:30)
A Nuclear Reactor and a Boy Called Lovey - S2-E13
Continuity mistake: When George is talking to Veronica at the lockers, there is an extra behind him who is constantly appearing and disappearing at the lockers behind him. (00:02:00)
A Stunted Childhood and a Can of Fancy Mixed Nuts - S2-E10
Continuity mistake: When Missy and Paige are tying George's feet together, the position of their hands and the rope is constantly changing between all the camera angles. (00:08:20)
A Stunted Childhood and a Can of Fancy Mixed Nuts - S2-E10
Continuity mistake: When we see Missy and Paige in the bedroom, Paige has something in her hands that swaps position between two consecutive shots. (00:07:10)
A Stunted Childhood and a Can of Fancy Mixed Nuts - S2-E10
Visible crew/equipment: When Missy puts her sunglasses on in the car, a square stage light is reflected. (00:04:00)
An 8-Bit Princess and a Flat Tire Genius - S2-E8
Continuity mistake: Near the end, when Hershal is talking to George over a beer, the position of the two empty spots in the pack keeps changing. In some shots, the 2 beers are taken from one side, and in others, one is taken from each side. (00:15:30)
Carbon Dating and a Stuffed Raccoon - S2-E7
Continuity mistake: Sheldon places his membership cards down on a flat surface. He puts Radio Shack first, followed by Star Command, almost entirely covering it, leaving just a small section of red along the top. When the shot changes to a wide-angle one, the Star Command card has moved down and more red is visible above it. (00:01:00)
Seven Deadly Sins and a Small Carl Sagan - S2-E6
Continuity mistake: When Gene is showing Mary the poster, he stops at the bottom of "Heck House" before revealing the rest of the poster. When the shot changes, part of the "Gene Lundy" wording is now visible, and then he goes on to show the rest of the "Gene Lundy" part. (00:09:50)
A Research Study and Czechoslovakian Wedding Pastries - S2-E5
Continuity mistake: At the dinner table, when discussing the research study, Missy switches from eating to arms folded several times between instant cuts. (00:04:10)
A Financial Secret and Fish Sauce - S2-E4
Continuity mistake: At Tam's, the food around Sheldon's mouth changes size and position between shots. (00:10:30)
A Crisis of Faith and Octopus Aliens - S2-E3
Continuity mistake: Sheldon asks if his dad checked Mary for ticks. When he does this, he is covering his mouth and nose with the collar of his shirt. When we see George from behind Sheldon, Sheldon isn't covering his face; then, as we see Sheldon from the front again, he lowers his shirt from round his mouth. (00:14:50)
A Crisis of Faith and Octopus Aliens - S2-E3
Continuity mistake: When the church receptionist is talking to Mary about life being precious, she is holding the mug differently in different shots. (00:04:50)
A High-Pitched Buzz and Training Wheels - S2-E1
Continuity mistake: When George gets out of bed to go and comfort Mary at the window, he puts his hand on her shoulder. When the camera changes to a view from the front, the hand on her shoulder has gone. (00:09:50)
A New Home and a Traditional Texas Torture - S7-E12
Factual error: When Sheldon is visiting the comic store for the last time, you can see a comic called Future's End. That comic didn't come out until 2015, but this episode is set in 1994.
A Roulette Wheel and a Piano Playing Dog - S7-E2
Character mistake: Sheldon likes his pretzel and says "Ich bin ein Heidelberger." He makes the same mistake President Kennedy made when he said "Ich bin ein Berliner", which means "I am a jelly donut." The correct German is "Ich bin Berliner" or "Ich bin Heidelberger."
A Dog, a Squirrel, and a Fish Named Fish - S1-E20
Continuity mistake: When Pastor Jeff is talking about "Love Thy Neighbour," the Bible is open in his hands, apart from one shot where it closed. (00:13:20)
Summer Sausage, a Pocket Poncho, and Tony Danza - S1-E21
Continuity mistake: When Missy tries the Lobster for the 1st time, the way she holds her fork keeps changing between shots. (00:16:50)
Summer Sausage, a Pocket Poncho, and Tony Danza - S1-E21
Continuity mistake: When George Sr. is cracking the claw of the lobster, he goes from holding the cracker to holding a fork instantly. (00:16:38)
A Tummy Ache and a Whale of a Metaphor - S2-E12
Continuity mistake: When Sheldon comes round from his op, the way he holds his cup, and the way the straw faces, changes between shots. (00:09:30)
Answer: Some people just have a dislike for someone that can't be explained. Could be as simple as the way he's dressed.