Immediately prior to said mission, there's another one where supporters of Keith David show up to a rally with "I <3 Goliath" signs.
His loyalty mission involves him fighting Rowdy Roddy Piper.
This becomes a Running Gag throughout the game.
During one of the cutscenes, Kinzie talks with him about how he looks and sounds a lot like Julius Little, the original leader of the Saints.
If you pick the Nolan North voice, then you'll get plenty of these, since Nolan North is apparently playing himself.
Laura Bailey also voices Street Fighter's Chun-Li, who possesses a Spinning Bird attack-albeit, one that's a kick.
The line Female Voice 1 says while doing the "Quarter Circle Forward + A" taunt is "Spinning Bird Punch!".
In the "Gat Is Back" Trailer, Gat says "You thinking I wanted to go to Hawaii or something?", a reference to Daniel Dae Kim's role in Hawaii Five-0, Lost, his current residence, and to the rumor that Gat "died" in the previous game because Kim was too occupied with Hawaii Five 0 to provide more lines, which he later commented as wrong.
Future Shaundi in the How the Saints Save Christmas DLC.
After certain missions are completed, the girls start to look the part as well, adopting superhero costumes and personas in certain circumstances.
The female gang members in the simulation might count as well. If they are female and have a name, it's likely they are one in this game.
Action Girl: The female versions of the Boss, Asha, Shaundi (plus Fun Shaundi) and Kinzie.
You have to grab them with Telekinesis and throw them back at him to damage him through his force field until they stop spawning.
Action Bomb: During the last fight against Zinyak he'll summon exploding C.I.D.s to swarm you once he's at half health.
Doing so will get you a Non Standard Game Over and the "You Chose.
Achievement Mockery: There's a scene where Zinyak asks you to surrender and be executed, and promises if you do so he'll restore the Earth.
And after clearing Matt's second sidequest, you get a collectable tracker that makes true 100% more of a go to point A and B than flailing around looking for that Last Lousy Point.
100% Completion: Made much more enjoyable than normal, because your homies give you specific tasks to complete in the game world, and doing groups of them give you new weapons or superpowers.
The President: We lost twenty points, we can get 'em back.