Hope was not wiped out of existence in the sense that a time traveller went back and killed her as an infant or something.
Hope was born, lived, and went into Malivore and her existence was wiped from the collective consciousnesses of those who knew her. However, the events that she participated in still happened, so Klaus will not be "suddenly alive again", etc.
7 & 8 were awful. I only watched out of loyalty.
3 and 4 were the best.
Werewolves' healing abilities are optimal on a full moon.
At other times, it is reasonable to assume that significant injury.... such as massive blood loss... could kill them.
Klaus was under the Hybrid curse for most of his 1000s years of life, it was only broken during the Sun and the Moon Ritual (VD 2x21)
His werewolf part was suppressed prior to that.
Jeremy is resurrected by Bonnie in the S4 finale.
He remains a supernatural Hunter.
Bonnie dies as a consequence of excessive use of magic.
Do you remember the address of your childhood home?
Anyway D was visibly surprised when he saw Enzo in the classroom.
Do you remember your best friend's / (ex)girlfriend's / (ex)boyfriend's cellphone number from three years ago?
Do you really expect Damon to remember Enzo's Augustine number after 60 years?