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Bryan Cranston was unaware that the VFX team had to move their arms and he laughed pretty hard when he saw this. While there were usually human proxies for all of the different animal characters Cranston could interact with, it seems that he occasionally got it wrong. Since the VFX team could not precisely change the position of an elephant's mouth, it was decided instead to use the technology to move the actor's arm so that it feeds the right spot. I certainly didn't notice Cranston's arms switching from real to CGI and back again, so I guess this just goes to show the quality of the work coming from the VFX teams.