I would have to agree there, I enjoyed some of the extras except the cocoon part.
I don't think it cause continuations issues because the DC version is not canon, whereas the extended versions of Aliens is. Not sure what the status of the versions of the other films, I would prefer the AC version of Alien 3 to be canon as ox thing is better than the dog in my opinion.
The chestburster is too large when it comes out of the dog, meaning the dog should have long been dead plus there is no reason for the chestburster to be more developed as it is. But with the Ox, it makes sense, the rib cage was too strong, it couldn't get out, so it continued to grow within, killing the ox.