The mega shredder is homage to the Japanese monster movie
Raphael paraphrases Star Wars: Empire Strikes Back, the line Han delivers after cutting open the Tonton. I thought they smelled bad on the outside."
The scene where Leonardo attacks the Mega Shredder is a direct reference to the fighting style of characters in the manga/anime Attack on Titan. Specifically, his fighting style closely emulates Captain Levi, with the fight in this show taking several action beats from Levi's fight against the Female Titan.