• In the state of Virginia (where Mystics Falls is said to be) if you are under the age of 21, all IDs are supposed to be vertical. However, when Sheriff Forbes looks in Vicki's purse her ID is horizontal.
• It is possible that Vicki had been using a fake ID, but wouldn't the sheriff notice it was fake, especially when she knew the Donovan family personally, and knew Vicki was underage?
• It is highly unlikely that the Salvatore Estate, located smack bang in the middle of town with a house opposite, would fall into disrepair and suddenly be in the middle of nowhere.

• Logan, the newly turned vampire, claims he cannot get in his own house because he got no one to let him in as Logan lives alone. But if no one human lives in a house vampires can get in without being invited in as it was implied in the situation when Damon killed Ms. gibbon to get into the tomb vampires' lair.
• It is far more likely that Damon would have smelt the pile of bodies in the Fell Warehouse before Logan pointed them out, especially with his heightened senses.

• The address that Matt writes on his application form is different to that on Vicki's driver's license.
• Elena asked what Stefan looked like in the 1950s. However, she had already seen him on the news of 1953.
• It is plausible that Dr. Gilbert could fake medical files, but how did Miranda fake a pregnancy? In a small town, somebody would notice.

• During flashbacks a copy of Renoir's "Two Young Girls at the Piano" can be seen on the wall behind Katherine. This painting was painted in 1892, which happened 28 years after the flashbacks took place.
• The men of Mystic Falls should be fighting in the Civil War, as they seem able-bodied enough.
• Giuseppe's tombstone says that he died in January 1864. However, the Founder's Ball, during which he was alive, took place in September that year.
• If Johnathan Gilbert found out that Pearl, the woman he loved, was a vampire who could walk in the sun, wouldn't he write that down in his journal?

• After Damon forces Elena to drink his blood the amount and position of the trickle of blood beside her mouth and on her chin changes between shots.
• Damon sees Katherine muzzled in Stefan's room. So why was he surprised when Stefan said that he was the last to see her in History Repeating?

• Why would Anna turn Logan, then abandon him? Surely she could have obtained the Fell journal without making him a vampire.
• When Elena shows up to talk to Damon, she takes off her scarf twice

• Jenna's search changes from "Peterson" to "Trudie Peterson" from one frame to the next.
• Why did Isobel have Trudie killed? If it was so she could not tell Elena too much, why not just kill her earlier before she could say anything at all?

• When Elena pulls the stake out of Harper's leg for Stefan, when they are rescuing Stefan, Stefan's hands are still tied and the rope is trailing over his shoulder, then Damon tells them to hurry up and they are leaving the room and Stefan's hands are untied and the rope nowhere to be seen.
• Damon can enter the house after killing Samantha Gibbons. However, Logan could not enter his own house after becoming a vampire.

• Vanessa Monroe mentions that Katherine arrived in Mystic Falls in April 1864. However, the Atlanta campaign fires, which she used as a cover-up, took place in early September that year.
• When Caroline and Stefan arrive to Tyler's party, she's wearing a significantly amount of eyeliner on her eyes.When she meets with Matt, she is wearing almost any make up.

• When Caroline is sitting down in the dungeon on the Lockwood Estate and has blood on her mouth, the blood changes its consistency.
• Damon was able to compel Tyler in Haunted before he triggered his werewolf curse, so why couldn't Katherine simply compel Tyler to kill someone to trigger his werewolf curse instead of compelling Jimmy?

• When Bonnie is preparing to send Elena a message she tears a page out of her notebook, closes the note book and starts to write the message, then the camera angle changes so you can see what Bonnie is writing and her notebook is open and she is writing on a page that hasn't been torn out of it.
• Elijah was unable to recognize that Elena's vervain necklace belonged to his sister, and his mother even though it was been in their family for 1000 years.

In the scene when Elena is talking to Elijah, in one screenshot we see Elena's hair on her shoulder's but when it changes to a different camera her hair is down in front of her.

• When Vicki shows up to Jeremy as a ghost, she was wearing a different outfit than the one she wore before she died, the Halloween vampire costume.
• When Caroline, Bonnie and Jeremy are at the Gone with the Wind screening, they are watching the part where Scarlett walks among the wounded Confederate soldiers at the Atlanta train depot. Later in the episode, when Damon has escaped and is hallucinating about Katherine, the scene playing from Gone with the Wind is Scarlett leaving the hospital as the Atlanta residents prepare for the siege, much earlier in the actual film.

"Ordinary People"

• During the flashbacks to 1000 years ago, Klaus says "We were just having fun." But the word "Fun" wasn't invented until Shakespeare times, about 500 years after these flashbacks take place.

• When Damon is laying Elena's bed, after she says that Rebekah allows love to "consume her, Elena rolls to her side to face Damon.? Damon rolls onto his side to face her.? Elena says, "I'm not mad at you for letting him out, Damon."? She then reaches to turn of the light on the nightstand.? When the camera angle changes and they cut to a wider shot, Damon is on his back again.? When they cut back to the close up is on his side again.

• Klaus cannot get into the Gilbert house as he has not been invited in. However, both Elena and Jeremy have died at least once meaning the seal should be broken and all Vampires should be able to enter.

• In the Reckoning. When Stefan is running after Elena, he runs into the cafeteria to stab himself but when he turns around you can see the point of the stake and that it did not enter him.

When Stefan was saving Matt he should have been able to take of Elena's seatbelt so she could have swam up to the top and save herself, preventing her from becoming a vampire.