Good movie but a couple of nitpicks

Saw this for the first time and enjoyed it. One thing I didn't think suited it was the music. It's a 70's film and understandably the music is very much of that era but the tone of it didn't seem right to me. At the beginning the music accompanying sounds too lighthearted as if it could almost be some daytime TV cop drama like Colombo or something, not a more serious thriller with a bunch of murders in it.

Another thing was Redford's reaction when he comes into his work building and sees all his friends and colleagues murdered. I didn't feel he really sold being shocked and fear-stricken by it all. It was more akin to reacting like everybody had vanished rather than been shot dead in the few minutes he popped out. Aside from that I liked his performance.