can anyone tell me the official shades of the blue and red of the flag?
The government procurement specification for American flags (DDDF416) defines the colors as "Old Glory Red" and "Old Glory Blue" as defined in the Standard Color Reference of America, 10th Edition. I believe that the most commonly used Pantone equivalents are PMS 193C for red and PMS 282C for blue.
Many people are surprised by how dark the official flag colors are compared to, say, the ones used in the British flag. The red, in particular, can actually look slightly purple in some lighting conditions.