Fourth wall

Sometimes a Character in the Crash Series will state an actual Crash Game, or look at the player, which is called a fourth wall breakthrough, and this has happened several times in the series.

Crash Bandicoot
Before Crash hops on a Hog in Hog levels, he turns around and looks at the player and raises his eyebrows up and down.

Crash Bandicoot 2: Cortex Strikes Back
Alike the previous Game, Crash raises his eyebrows up and down and looks at the player before hopping on Polar in Polar levels.

When on a Game Over, a Hologram of Cortex will directly confront the player and say "Game Over, Hahahahah".

Crash Bandicoot 3: Warped
When Crash is smacked with a Two-Headed Giant's Club in Double Header, Crash will hit the screen and slide down.

On a Game Over, Uka-Uka will confront the player and say "Game Over!".

in the bomb death in the jet-ski levels ,coco will look toward the player

Crash Bandicoot: The Wrath of Cortex
On a Game Over, Cortex, like Crash 2, will confront the player and say "Giving Up?".

Crash Bandicoot 2: N-Tranced
A secret message appears off-screen in Wild Nile Ride that can only be seen with a Graphical Tool and is shown in the Official Prima Strategy Guide, showing on a Wall in one area with a bunch of yellow Dots forming the word "TATTA" or "YATTA" with the Vicarious Visions Logo, and a smiley Face.

Crash Twinsanity
Cortex mentions to the Penguins at one point "The Wrath of Cortex didn't go very well and--".

Cortex blasts Farmer Ernest gaining the crystal he had he then looks at the player and says "I'm an evil scientest, what do you expect? This isn't a game."

Crash Tag Team Racing
Von Clutch mentions that he has all of Crash's Games and that they are his Favorite Video Game Heros.

When the Yeti eats Crash in the Die-O-Rama "Cold Lunch", he looks at the Camera and shrugs his shoulders.

Crash waves at the Camera in certain Die-O-Ramas.

Crash smiles at the camera in some Die-O-Ramas.

Crash of the Titans
Cortex mentions that his name is on the Stationary, reffering to Radical Entertainment, he also pulls out a Contract.

Tiny says to Crash "that he's still mad about the last Game" reffering to CTTR, which he did not appear in.

In the DS version, Tiny says "Cool, maybe i'll get my own series now".

One of the Voodoo Bunnies mention Crash Twinsanity, and Uka-Uka's Boss Fight in it.

Crash: Mind Over Mutant
N. Brio yells out in a Cutscene "I, was in the First GAME!!".

In the same Cutscene as N. Brio, Cortex reffers to the animation of the Cutscene, 2D.

One of the Slap-Es says "Curse you Video Games!".