Dirt wasn't under the film, but the deep scratch made it look like it was dirt under the film, not that it was actual dirt. It was just how the scratch looked like under the Xpel.
Here is a picture of the scratch. Probably hard to tell how deep it is, but it is something that can be felt when running your finger across it.
https://i.imgur.com/63TYXKa_d.jpg?ma...&fidelity=high