Getting all the fake blood on his face was what he had been in the makeup trailer for in the first place, which, according to Mandalorian producer Jon Favreau, led to a pretty funny exchange when Pascal went to get checked out, as the staff couldn’t tell the difference between the real and fake blood…
That’;s the one episode where Mando removes his helmet, to show that he’s been severely injured by the ensuing battle.
That by itself isn’t necessarily all that funny, but the punchline comes when you realize that this was during the filming of the first season’s final episode.