For some reason, cats don't purr anymore - they only meow.
They used to purr in some earlier 0.x version of Minecraft PE.
Cats don't make the purr sound
Endermen do not have idle sounds
Baby ocelots that spawn alongside an adult behave as if they were tamed but have an untamed ocelot skin
Baby mobs no longer make idle sounds.
Wild Ocelots meow like tamed cats
Villager sounds are mismatched
Wolves are missing some idle sounds