Referenced by...: The comic Army of Darkness Vs. Hack/Slash #1 has a cameo by Jason Voorhees during a page showing various events in Ash's life. Also Ash wears the same black leather jacket he was seen wearing in the first Freddy Vs. Jason Vs. Ash series throughout the Hack/Slash crossover.
The events of this series are brought up by Claptrap in Poker Night 2, since Ash is a featured character in that game.
What Could Have Been: The story started out as a script for a movie bringing the three horror icons together but the rights holders couldn't agree (allegedly over the idea of Ash killing the two horror villains) so the project was scrapped.
One early plot involved the parents of all of Freddy and Jason's victims raising money so they can hire Ash to hunt them down.