I found all six:
1) The bird hair
2) One puddle is missing
3) The girl’s left ear is missing
4) The feather on the dad’s hat doesn’t have a stripe
5) One of the fish’s mouth is closed instead of opened
6) A water droplet is missing

I found all six:
1) The bird hair
2) One puddle is missing
3) The girl’s left ear is missing
4) The feather on the dad’s hat doesn’t have a stripe
5) One of the fish’s mouth is closed instead of opened
6) A water droplet is missing