Yes, I had my suspicions about the lack of consideration for Plate Tectonics in the Snowball Earth idea.Snowball earth, the scientist that first postulated the concept of snowball earth did so because he found evidence of glaciation in Nambia at the equator.
After discovering this he did the hard work of science and looked for similar evidence in other areas of the earth and found it. From his work he determined that earth was once covered in snow and ice.
He missed only one thing. Plate tectonics. In the time period that was showing glaciation all the continents were gathered together in the supercontinent Rodina, surrounding the earth's southpole.
It's not what you know that is more likely to cause problems, it's what you don't know.
Thanks for that sidebar Fun Facts