#5: Yumeria's mother suddenly appearing in the Grand Delusion, where she transforms into Akiba Yellow and fights like a badass. Add the fact that she's Dead All Along and it's the Jetman episode all over again.
Yumeria herself gets her own moment with the team performing a special Yellow-centric finishing move:
Malshina gets one as she blocks machine gun fire for Akagi allowing him to go alert the others to the truth.
#12: Itasshar Robo grows into a giant like the official Sentai robots.
In response, knowing that winning the battle will end the show, Akiba Red sets it to shoot its missiles at itself. It goes down in spectacular fashion.
In an effort to keep the show running even after Saburo's attempts to wrap up the plot, Marushina and the Akibarangers literally fight the end of the show. It doesn't work, but the fact they even attempted it is fantastic.
Akiba Red after gaining his armor: Aoi-tan is my waifu! Super Akiba Red!
Real life example: The fact #5 will have biggest shout out/tribute to Power Rangers ever since the show first came on the air shows how far its popularity has become in Japan.
Non-meta one: Akagi and Yumeria continuing to stand up and reminding the Americanized!Tyrannoranger and Americanized!Dragonranger the real essence of Sentai: Passion to help the innocents and children... all despite being de-morphed and beaten up. After Nobuo uses the DX Zyusoken, it snaps Tyrannoranger and Dragonranger back into reality and washes away their brainwashing.
In #6, Nobuo Tanaka comes at Hakase's request to announce over the fight, giving Nobuo Akagi an idea to help him beat the Monster of the Week.
In #7, General Pain enters the delusion world and reveals his identity to the Akibarangers.
In #9, Itasshar Boy, the size of a Machine Itasshar figuart, beating a giant sized mecha!
In #10, The Akibarangers pull out not only the three Inordinate powers from season 2, but the three from season 1 as well, and combine all six powers into the Inordinate Cannon-Bazooka.
All of #11 is one for Malshiina, who all season has been working behind the scenes to enact her master plan and was actually the force that brought Akibaranger back to TV! She gives everyone back their memories of season 1, takes down Hatte Saburo, defeats all 37 Super Sentai teams and conquers their shows, makes Luna realize the value of her friendship with the team and gets into the Guiness Book of Records. Kneel brief mortals, for Malshiina is no longer a mere supporting character, but the BOSS!
But the most awesome part of it? She speaks directly to the viewers for their support in her plans. And she's actually very convincing.
Episode 12. Saburo Hatte and Malshina team up with the Akibarangers to fight Ultraman expy Prism Ace, which leads to giant Super Akiba Red.
One for Toei themselves: Prism Ace and the plot around him is one massive Take That! to Chaiyo Production's very shady attempted theft of the Ultra franchise, right down to the name of the company that created him (Chigauyo) being only a few letters different from Chaiyo's (and reworked into an insult no less, with Chigauyo being a play on the Japanese words for 'wrong' or 'fake').