A Computer, a Plastic Pony, and a Case of Beer - S1-E12
Continuity mistake: When we see Sheldon in bed at the start he's either flat on his back or on his side depending on the shot. (00:03:45)
A Computer, a Plastic Pony, and a Case of Beer - S1-E12
Continuity mistake: When Georgie meets Sheldon by the school lockers, he grabs his lunch bag from inside. From the opposite angle, he's taking it out again.
A Computer, a Plastic Pony, and a Case of Beer - S1-E12
Continuity mistake: When Mary lies in bed with Meemaw, the way Mary's right arm and hand lie on top of the left arm differs between shots. Check the way the hand covers the sleeve, for example.
A Computer, a Plastic Pony, and a Case of Beer - S1-E12
Continuity mistake: When Sheldon and Missy lie in bed together, her right hand is on top of her left. A shot later, it's the opposite way. (00:09:16)
A Computer, a Plastic Pony, and a Case of Beer - S1-E12
Continuity mistake: During the spaghetti meal scene, the way Missy holds her fork changes between the back and front shots, especially during the last shots.
A Computer, a Plastic Pony, and a Case of Beer - S1-E12
Continuity mistake: Sheldon pinches a loaf of bread, but a shot later he's pinching spaghetti. This changes back and forth a couple of times.
A Computer, a Plastic Pony, and a Case of Beer - S1-E12
Continuity mistake: When the family leaves the computer store, Missy's candy sucker swaps randomly between being in her mouth or not between one frame and the other.
A Computer, a Plastic Pony, and a Case of Beer - S1-E12
Continuity mistake: When Missy calls Mary "Cave-mum," she has both hands up in front of her. However, when the shot changes, one hand is lowered. (00:01:15)
Answer: Some people just have a dislike for someone that can't be explained. Could be as simple as the way he's dressed.