Answer
The layout and spelling on your final product will look exactly like the design proof.
The color on your final products may be slightly different from your online proof due to RGB and CMYK conversion. A computer monitor has an RGB display, while we print with CMYK ink, which is standard in the printing industry. A computer screen mixes shades of red, green, and blue (hence RGB) to create color pictures. A CMYK printer must compete with the many shades of RGB with only one shade of each of cyan, magenta and yellow, which it will mix using dithering, half toning, or some other optical technique.
Comparisons between RGB displays and CMYK prints can be difficult, since the color reproduction technologies and properties are so different. There are some colors which a computer monitor can display which are impossible to identically recreate when using the standard CMYK inks available.
Note that matte materials such as Matte Vinyl Banner, Versafabric, and Canvas, will produce a slightly-dulled color, but the matte finish is beneficial as an antiglare feature and aids in long-distance readability.