Baked texture map shows weird distortions, is it mistake or not? After i baked diffuse map i got these weird distortions, but i don't know if i should worry about them and unwrap mesh differently.
You are subdividing your UV map with a subdivision modifier.

Go to the subdivision modifier and uncheck UV Smooth, if you don't want to subdivide the UV map.

From the manual:


  UV Smooth
  How to handle UVs during subdivision.