Other things too, from thinking about modern birds: can we assume that theropods had a syrinx rather than a larynx? Then they would be able to have very tonally-complex sounds, including vocalizing multiple different frequencies at the same time.
I assume they had a similar lung layout? Birds have a really brilliant respiratory system. The lungs are rigid and more like tubes for the passage of air rather than storing it. On inhalation, half the air goes directly into one air sac and the other straight through the lung into a different air sac; then on exhalation the sacs reverse so that the "used" air goes straight out and the "unused" air goes through the lung on the way out. So they get fresh air moving through their lungs both on inhalation and exhalation, and they never mix fresh air with used air. This means that the oxygen content of air in their lungs is much higher, which means that the oxygen levels in their blood can be much higher. It helps sustain them during high metabolic activity such as flight; I'm sure their giant predatory ancestors made good use of that oxygen as well.
I wonder if their ancestors had a similar sort of relatively inefficient fast-through digestive system, or whether that's an adaptation their descendents have made for flight? It's known for a fact at the very least that some dinosaurs consumed rocks to aid in digestion (gizzard stones) in the same way birds consume grit. Hmm, so theropods would likely have some sort of a crop then? I mean, there is evidence that at least some theropods cared for their young. Picture a bunch of baby velociraptors reaching their heads into a parent's jaw to get a meal!
It takes no imagination to picture correspondence between the legs / feet, bird legs and feet already look positively dinosaurian.
Even the evidence of fossilized prints of rough scaly skin from some tyrranosaurids (in addition to evidence of feathers, and some completely feathered) shouldn't be a real shock because we see that in modern bird species. For example, look at the head of a bald ibis or turkey vulture.