The role of 'Visiting Man' was played by the sound man, Jason Rowland, after the original cast member had a family emergency. Unfortunately, the entire suit didn't fit Jason, who was wearing shorts that day. The team had to film him in a way to not reveal he was wearing shorts with his suit.
The Teacher role was played by Vironica Dawson, who also plays a teacher in real life. She has worked as a studio teacher on many film sets, like the movie, 'Paper Towns'.
Young Will Willimon was played by actor, Charlie Hitt. This was his first leading role.