It also features a scene that is a direct reference to the famous Last Shooting from the OG Gundam.
Srungle has a lot of references and cameos in general, but episodes animated by Masami Shimoda and Nishimura Motohide seem to be especially notable in that regard.

Srungle performing a flashy kanada kick, not even to hit the enemy directly but to blast it with a thruster on the back of its leg, is such an insanely cool power move.

Bonus points for awesome and eyecatching effects shapes

My favorite example though is this scene near the end of the episode, where Marco opens the forbidden door and finally breaks the illusion. The final shot, where hand-drawn Marco stands in the middle of real ruins, is especially powerful.

(Rapid flashing warning!!)

Also, while the entire show is a collage of animation and real life footage, I think this is the first time they blend together so well. Marco's frantic run through the ruins of a palace is a good example of how cleverly Hirata mixes them together to enhance the surreal feeling

I appreciate how skillfully Kawajiri utilizes feverish colors, limited animation, sound and lighting to highlight how horrific the fight with Qara'unas is for young Marco. Everything happens so fast that the scared boy can only hear the sounds of swinging and colliding blades.