Continuity mistake: The land rover's position at the hardware store changes between shots. Note the yellow line.
Continuity mistake: When McGregor collapses his glasses come off and end up on the lenses. Camera changes and they are flat on the floor.
Continuity mistake: At one point when Tom is chasing Peter and Benjamin for the first time, he hits the ground with a tool, camera turns 90° to the left and now Tom is in front of the camera again. No way for him to cover that distance instantly.
Continuity mistake: When the rabbits are watching Tom clean the greenhouse, Bea mentions McGregor, at which point Cottontail pulls out a blackberry and squashes it. In the next shot the blackberry is gone and Cottontail's paw is completely clean.
Continuity mistake: When Tom is attacking the teddy in Harrods, the teddy changes positions between the CCTV and actual angle. Note the bear's feet in relation to the corner of the wall.
Answer: It's not clear if he actually can hear them or not. It's implied in the film that it's possibly stress or a mental break that is causing him to hallucinate their voices, or is suddenly thinking on a brain wave length that can understand them. If it's the former, it's coincidence that he hears similar to what Peter is actually saying. Either case explains why he suddenly can hear them when nobody else can around them despite them talking in front of people.
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