I forgot to mention one further source of aggravation during my second BU10 game on Saturday. On the orange team side of the field a man was walking up the touch line, talking on a phone. Not normally aggravating, but he had a toddler (between 18mo and 2yo) with him. The child was wandering onto the field! I had to hold up the game until he noticed the kid and (sort of) herded him back off the field. Didn't take the child's hand or anything useful like that, just nudged him off of the field.
I later saw this same person (dad?) seat the child about 3 feet off of the touch line, near the halfway point. I realize that this is a U10 game and the ball doesn't travel with the force or speed that you'd expect with U16 or U19, but really... putting a small child, on the ground, where they can take a ball in the face is just stupid. I wonder if I should have had him move the child -- the people on that side were already annoyed with me, so one more thing probably wouldn't have hurt.