Cape Canaveral, Schrödinger's Cat, and Cyndi Lauper's Hair - S1-E8
Continuity mistake: When George Sr. goes to wake Sheldon up, we see Missy lying on her bed with her leg stuck out and uncovered by the duvet. When we see George closing the door, Missy's leg is now covered by the duvet. (00:05:55)
A Brisket, Voodoo, and Cannonball Run - S1-E7
Continuity mistake: When George Jr confronts Sr about looking for a brisket recipe, Sr has the box closed in one hand in one shot and open with 2 hands in another. (00:06:10)
A Patch, a Modem, and a Zantac - S1-E6
Continuity mistake: When Sheldon is laying on the sofa, the creases in the rug on the back keep changing between shots. (00:12:45)
A Patch, a Modem, and a Zantac - S1-E6
Continuity mistake: When Sheldon is doing the maths for NASA, he taps the chalk on the board twice, leaving two dots. These dots disappear in subsequent shots. (00:14:50)
A Patch, a Modem, and a Zantac - S1-E6
Continuity mistake: When Sheldon is lying on the sofa, his position changes several times. Note his shirt sleeve in relation to the edge of the cushion he is lying on. (00:12:50)
A Patch, a Modem, and a Zantac - S1-E6
Continuity mistake: At the dinner table, when Connie says, "Well, that goes without saying," George JR has a beer bottle on the table. Camera changes, and now he's holding it up in the air. (00:03:10)
A Patch, a Modem, and a Zantac - S1-E6
Continuity mistake: At the start, Sheldon has his arms crossed at the dinner table, and then the shot changes. When it does, he has a fork in his hand and a hand up by his face. Shot changes again, and he's back to having his arm folded. (00:03:21)
A Patch, a Modem, and a Zantac - S1-E6
Continuity mistake: When George Jr. asks the NASA representatives if he's seen the movie Aliens, the man goes from standing up to leaning on the podium between shots. (00:01:05)
A Solar Calculator, a Game Ball, and a Cheerleader's Bosom - S1-E5
Continuity mistake: When Connie is playing the slot machine at the end, the wheels land in a set order. She then has a chat with someone and then goes to spin again, but the wheels are in different positions than before. We see Connie through all of this, and she doesn't spin between the two instances outlined here. (00:17:30)
A Therapist, a Comic Book, and a Breakfast Sausage - S1-E4
Continuity mistake: When George Sr. is first trying to help Sheldon, who is choking, he has his left arm under Sheldon's body. When the shot changes, his left arm is across the back of Sheldon's neck. (00:00:40)
A Therapist, a Comic Book, and a Breakfast Sausage - S1-E4
Continuity mistake: When Connie is talking about her date possibly wanting some more of her, George Jr. has a fork in his hands. When the shot changes, his hand is at his mouth without a fork in it. (00:04:55)
A Therapist, a Comic Book, and a Breakfast Sausage - S1-E4
Continuity mistake: When Connie, George Jr., and Missy are sat in the car, eating ice cream, Missy goes from holding the spoon to not holding it and back to holding it, depending on the camera angle. (00:14:40)
A Therapist, a Comic Book, and a Breakfast Sausage - S1-E4
Continuity mistake: When Sheldon points out how big the sausage was that he choked on, he holds his hands up in the air to symbolize this. From the shot behind Sheldon, his hand is not visible. (00:03:00)
A Therapist, a Comic Book, and a Breakfast Sausage - S1-E4
Continuity mistake: When Tam moves his stuff on the lunch table, his arms are around his lunch. When the camera does an instant cut, his arm is no longer around his lunch. (00:03:30)
A Solar Calculator, a Game Ball, and a Cheerleader's Bosom - S1-E5
Continuity mistake: When George Sr sits down to talk statistics with Sheldon at the kitchen table, his beer bottle keeps rotating in his hand. Note the label. (00:08:30)
Continuity mistake: At the start, the cards in Sheldon's hands keep changing between shots. (00:00:40)
Rockets, Communists, and the Dewey Decimal System - S1-E2
Continuity mistake: When Tam mentions the Ku Klux Klan, Mary has nothing on her fork. When the shot changes, she's suddenly got some food on her fork. (00:15:40)
A Broom Closet and Satan's Monopoly Board - S3-E2
Continuity mistake: George invites Mary out to dinner on Friday. But while they are at dinner, Sheldon is attending his college class (with Dr. Linkletter) - which meets on Thursday.
Answer: Some people just have a dislike for someone that can't be explained. Could be as simple as the way he's dressed.