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For the record, Bryan Cranston was not aware that the VFX team had needed to move his arms around, and he laughed pretty hard when he discovered this. While there were usually human stand-ins for all the various animal characters for Cranston to interact with, it seems that he would occasionally do it wrong. And so, since the VFX team couldn’t exactly change the location of an elephants mouth, it was instead decided to use the technology to move the actors arm so it was feeding the right spot. I certainly didn’t notice Cranston’s arms shifting from real to CGI and back again, so I guess that just shows the quality of the work coming from the VFX teams.