Initially I was thinking the same, makes sense for unimportant crowds in the background.
After looking at it again, I have an opening shot with the main chara cutting through a crowd and basically tells everybody to shut up. Similar to a detective arriving on a murder scene. I feel it needs a bit of noise in there as the crowd isn't in panic but there's a lot of commotion.
Thanks for your suggestions, maybe balloons with no tails.