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I noticed that he wasn't consistent in his windup motion. Throw out pitching from the stretch - all pitchers vary in order to try and confuse the runner. Slide step, short leg kick, whatever they can do. But with no one on base, Perez will sometimes (usually with two strikes) go to a far more pronounced turn, showing his back to the plate much more than normal. Maybe it's to confuse the batter, maybe because he wants to get a little bit more "oomph" on his fastball, but I have to agree that it makes me wonder how it impacts his control. I would think that it would be much more difficult to have his front foot land in the same place, and therefore throw off his mechanics a bit.
I'm not as concerned about his arm angle. I grew up with Juan Marichal. His arm angle was all over the place and it didn't seem to hamper his control. He loved to drop down sidearm with two strikes on a right-hander. Not to mention his leg kick is something you'd NEVER see now. He looked like the letter "Y"; left leg high in the air, leaned way back at the waist. It was a miracle he didn't just fall off the mound. Especially on a windy day at The 'Stick.