Successfully complete all Loyalty missions for every Homie before starting the “Punch The Shark” final mission to view the secret (good) ending before and during the credits. You can find the Loyalty missions under the “Quests” tab. Each quest listed with “Loyalty” in the title must be completed to unlock the secret ending.
Climb to the very top of Zin Tower in Rosen Oaks to find the secret Salem Broomstick vehicle. It is a broomstick that you can fly around on. The Salem Broomstick was part of the “Witches And Wieners” DLC from Saints Row: The Third.
In Brickston, go to the bridge leading east out of the neighborhood. Search for a hidden cave just north of the bridge, right next to the water. Inside the cave is The Penetrator (Dildo Bat) weapon from Saints Row: The Third.