We need a spoiler tag. Here's all the ones I figured out.
1: Jackal
2: Battletoads & Double Dragon
3: Duck Tales
4: The Krion Conquest
5: Felix the Cat
6: Metal Storm
7: Castlevania III
8: Kid Icarus
9: Batman Returns
10: The Lone Ranger
11: Batman
12: Kid Niki
13: Kirby's Adventure
14: Rainbow Islands
15: Milon's Secret Castle
18: Super Mario 3
19: Street Fighter 2020
20: Frankenstein
21: Bart vs The World
22: Transformers: Convoy no Nazo
24: Ghostbusters II (US Version)
25: Terminator 2
26: Castlevania 1
27: Bucky O'Hare
28: Zelda II
29: Hydlide
31: The Rocketeer
32: Karate Kid
33: Hokuto no Ken
34: Who Framed Roger Rabbit
36: Jaws
38: Predator 2
39: Super C
40: Ghosts N'Goblins
43: SD Splatterhouse
44: Little Nemo
45: Mike Tyson's Punch-Out
46: Totally Rad
47: Werewolf
48: Conquest of the Crystal Palace
49: Rockin' Cats
50: Bionic Commando
He included two Japanese exclusive games (Transformers and SD Splatterhouse), which sucks. A lot of people may not know about both of them.
43/50. And I wasn't sure which Ninja Gaiden was in that video. ^^;