Doctor Strange has scenes written by the creator of Rick & Morty, which is pretty fitting, actually

Doctor Strange is a dimension-hopping man capable of challenging your concept of reality. So naturally, when you need someone to write a few extra scenes for his debut movie, you call on the guy who co-created Rick & Morty, a cartoon about a dimension-hopping man capable of challenging your concept of reality - and decency. You call on Dan Harmon.

The Hollywood Reporter claims that Harmon was tapped by Marvel after initial production had wrapped, meaning that his contributions will be minor in the grand scheme of things. If I had to guess, it's likely that Harmon was chosen specifically for his ability to weave humor through inter-dimensional planes as he does in Rick & Morty. Still, Harmon's got a very good reputation among the type of crowd that will go see Doctor Strange, so his involvement is a positive.

This isn't the first time Marvel has been tied to Harmon, though. The Russo brothers, who directed Captain America: The Winter Soldier, Captain America: Civil War, and the upcoming Avengers: Infinity War films, were executive producers on the NBC series Community, which Harmon also co-created. Maybe we'll see another star from the show pop up as a cameo? Hey, it happened for Winter Soldier and Civil War.