Seeing holes in mesh while in texture mode I have just started teaching myself 3D modeling so that I can start making some simple 3D games in Unity. I am already familiar enough with code to start making things, but I lacked the 3D model assets. I been teaching myself Blender and created some very simple models. The problem I am finding is that I get what appears to be holes in the mesh. For example if I put the model into Texture mode I see what looks like a Face that is see through or another color. If I start moving Vertices in Edit mode I can make the hole disappear.  

Just wondering what I might be doing wrong to cause this problem. I know you are suppose to try and keep all faces quads so that is what I continue to do.   Basically all I am doing right now is making a flat model in a Top Ortho view and then extruding to add a 3rd dimension to the model. Am I doing things wrong? Just making a simple model of a ghost yet I somehow have this other section that appears to be a different color when viewed in texture mode. 



Here is the same model in Solid Shading mode


Thank you in advance for any help with this.
I think there mainly are two problems in your mesh.


Face normals are inverted.
You are using material node which is invalid to use by current render engine.




To fix them, you can switch to Edit Mode, then CtrlN to re-calculate normals, then deal with the material node as you wish.