The character of Johan has been played by 4 different actors. Victor Colon, Patrick Locurcio, and 2 other kids who's names aren't mentioned. Patrick Locurcio ended up being the final actor to play him and all the scenes with the character were reshot with Locurcio.
The film was originally just going to be a couple fight scenes with no story and no script when they had to cancel production due to winter. But during the winter the script was written and shooting started in August of 2017.
There are a total of 13 actors featured in the film.
Some of the original shots of Johan, when he was still played by Victor Colon, are still featured in the film.