Took me a while to find them. For those who give up, I’m placing their locations in spoiler tags:
Waldo: Lower middle. Above the mummy and ghost. Blends against the pants of the moustache guy with the red with yellow stripe sweater.
Woof: Upper left. Tail is behind a sleeping caveman holding a club without dream cloud.
Wenda: Upper right. Close to the cannon. Next to the guy lighting the fuse with a torch.
Whitebeard: Upper left. In front of the pink triceratops and above the scared cavemen group.
Odlaw: Middle middle. Above a shocked astronaut with brown hair and beard. Around the area to the left of the upside-down rocket. Twilight is on the UFO above him.
Twilight: Middle middle. Behind the UFO with three aliens to the left of the upside-down rocket. Odlaw is in the same area behind a brown-bearded astronaut.
Pinkie: Upper left. Behind the sci-fi movie background on the left-hand side. Look for a caveman about to hit a sleeping red dino and she’s on the right.
Rainbow Dash: Lower middle. Slightly above and behind the horror movie background. Look for the window with the stone buzzard head on the left.
AJ: Upper left. Right behind the blue dino with yellow eyes.
Fluttershy: Middle Middle. Next to one of the thrusters of the upside-down rocket.
Rarity: Lower left. Dressing room area (of course). To the left of the pink “Godzilla” going inside a door.
Woof: Upper left. Tail is behind a sleeping caveman holding a club without dream cloud.
Wenda: Upper right. Close to the cannon. Next to the guy lighting the fuse with a torch.
Whitebeard: Upper left. In front of the pink triceratops and above the scared cavemen group.
Odlaw: Middle middle. Above a shocked astronaut with brown hair and beard. Around the area to the left of the upside-down rocket. Twilight is on the UFO above him.
Twilight: Middle middle. Behind the UFO with three aliens to the left of the upside-down rocket. Odlaw is in the same area behind a brown-bearded astronaut.
Pinkie: Upper left. Behind the sci-fi movie background on the left-hand side. Look for a caveman about to hit a sleeping red dino and she’s on the right.
Rainbow Dash: Lower middle. Slightly above and behind the horror movie background. Look for the window with the stone buzzard head on the left.
AJ: Upper left. Right behind the blue dino with yellow eyes.
Fluttershy: Middle Middle. Next to one of the thrusters of the upside-down rocket.
Rarity: Lower left. Dressing room area (of course). To the left of the pink “Godzilla” going inside a door.
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