Polygon Problem

Okay, here's the situation: I have a helicopter model which I believe was created in 3DS, and when used in C4D (or Maya or Photoshop), and rendered in high quality, many of the UV mapped textures disappear from various polygons.

What I've found is that I can "pull out" certain polygons and that restores the textures for them.

MY QUESTIONS:

1) I am new to C4D - is there a command that can correct polygons that have the "inside" UV Map on the wrong side, and

2) is there a way to group select a number of polygon faces/vertices/lines at once on the outside of a mesh without selecting the vertices/faces of the "inside" portions of the mesh??

Thanks ADam that is useful - a followup question: I am finding that the apparent root of he problem is a number of cases where multiple polys are sharing the same vertex, including cases where the outside polys and the inside polys got too close and a common vertex merged.

Is there a way to split a vertex, to separate several polys without deleting the polys themselves?