There are two memories in the hub world and one in each level after that, except Sky Diving and Rex Ride.
Soccer Ball: After killing a bunch of wolf/dog evos and 3 ranged guys, you’ll walk up a flight of stairs. Before jumping through the broken window, break the door.
Providence (Hub World):
Prom Photo: In Holiday’s lab, look in the upper right corner.
“Evo Guys” Poster: In Caesar’s lab/Command Center, stay on the top level and go all the way to the right.
High-Tech Rubik’s Cube: After fighting the spiders for the first time, continue straight instead of turning right. You’ll have to jump over a gap to get this.
Video Journal: As soon as the level starts, you’ll be able to break a window on the left wall. After going through here, you can break a cracked wall, and the journal is back here.
Newspaper Clipping: Right after saving Holiday, you’ll go through a door. Afterwards, this is in plain sight and practicably unmissable on the left wall.
Lucha Libre Mask: After destroying the hives, you’ll walk up a winding ramp towards an eye. Ignore the eye and continue to the right.
Accordion: This one is the easiest to miss. When you need to repair the generator for the traffic lights, there is a yellow light on the right side. Go through here to find it.
Hong Kong Kids Photo: After an area where you fight one of the tree guys, you’ll break down a gate and go inside. There will be a bunch of small platforms making up a right and left path. Take the left path and you’ll find it.