We’d only finished shooting in March, so all the visual effects [in the trailer] were at quite an early stage.
When you watch the finished film, you’ll see that some of the designs of the cats have moved on since then, and certainly our understanding of how to use the technology to make them work has gone up, too.
Possibly there were, in the extremity in some of the responses, some clues in how to keep evolving [the production].