1. The mythology of the show in season one states that vampires can't procreate but they love to try. enter Klaus (an original vampire/hybrid has a baby which an entire spin
off show is based upon. how can Klaus have a baby when he is a vampire? Fans simply reply with
TVD Logic.
2. Doppelganger mythology. Stefan and Elena are part of a line of
doppelgangers that are magically draw together for centuries. how can Stefan and Elena be
doppel mates if it was impossible for them to meet since they were born in different centuries if Stefan had never turned into a vampire. fans reply with TVD Logic
3. Elena finds a picture of Baby DAmon and the picture clearly shows he has brown eyes while Damon Salvatore is admired for his beautiful blue eyes. Fans reply with TVD Logic.
4. Elena looks at a baby picture of a brown eyed Damon and comment that he has his
mother's eyes which are clearly blue. Fans assume Elena went blind and just reply with TVD Logic.
5. Elena had
Alaric who is an original vampire at the time compel all her memories of loving Damon away and when he becomes human a few episodes later his compulsion does doesn't wear off when logically it should because TVD Logic exists.
6. In season 3 of TVD it's established that a person can't be a vampire and a witch.
Bonnie's mother is turned into a vampire therefore severing her link to her witch lineage but in season 6 because of TVD Logic they introduce vamp/witches which clearly contradicts their established mythology.