The response actually prompted filmmakers to alter the CGI. Director Tom Hooper explained in an interview with Empire: “We’d only finished shooting in March, so all the visual effects [in the trailer] were at quite an early stage. Possibly there were, in the extremity in some of the responses, some clues in how to keep evolving [the production]. 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.”