Discrete opamp design
R7, R10, R11 are for thermal stability.  They add a little emitter degeneration, so gain is dependent on characteristics of a resistor (stable over temperature) rather than a BE junction voltage (changes a lot with temperature).

I would expect R8 to perform a similar function, linearizing Q7.  Except that it is bypassed by C1, which removes the effect at higher frequencies.  Maybe it's just a frequency response tweak?  Q7 is the voltage amplifier and contributes a lot of distortion.  I think Douglas Self has written about this.