Why do I get the feeling that this quiz is a week late? 
Part 1
1) Halloween II [Not Halloween (the first film). I got confused about this at first, but Jamie's hair was the giveaway: Halloween II Movie Poster]
2) Beetlejuice
3) Casper
4) Monster House [Thanks, EC!]
5) ?
6) The Rocky Horror Picture Show
7) Frankenweenie
8) Hocus Pocus
9) Shaun of the Dead
10) The Babadook
11) The Haunting of Hill House
12) ParaNorman
13) Scream
Part 2
[I'm assuming it's the character/monster they're after: in some cases the names vary from film to film, so I've given alternatives. For completeness, I've also given example films (most of them appear in a series)]
1) Fred "Freddy" Krueger (A Nightmare on Elm Street)
2) Valak / The Nun (The Nun)
3) Pinhead (Hellraiser)
4) Hannibal Lecter (The Silence of the Lambs)
5) Chucky (Child’s Play)
6) Damien Thorn (The Omen)
7) Leatherface (The Texas Chainsaw Massacre)
8) Ghostface (Scream)
9) Billy / Billy the Puppet (Saw)
10) Annabelle (Annabelle)
11) Pennywise (It) [The picture's of Tim Curry from the TV Mini-Series]
12) Samara Morgan (The Ring) [Note: In the original Japanese novel and film series, the character is Sadako Yamamura]