Hi Sharleen,
I have a Goyard Jeanne PM , I'm not an expert but I know a little about the brand.
The signature Goyard pattern is handpainted on the canvas, every little dot of it. The little dots of paint give the canvas a unique texture which is, I think, very difficult to replicate. I believe that fakes simply have the pattern printed, giving them a smooth surface. The problem with eBay is that photos rarely have the resolution or angle necessary to see this pattern well. :s
Anyway, that's my five cents and I hope t's useful to you