Throughout the production of a series, a lot goes on behind the scenes in regards to planning and design, which often go through multiple stages before resulting in the final version that is seen on screen. Some concepts and ideas can have an effect on the show and characters, and unexpected occurrences during production can also lead to changes and additions to the plans for the show.
In the original Rooster Teeth website release and the YouTube version of "Round One", Taiyang appears as a 2D image, due to his 3D model not being completed yet. In the DVD and Blu-ray versions and an updated re-upload on Rooster Teeth's website, this image has been replaced by the 3D model. As such, the Japanese dub also features the 3D model.
After Volume 3, Rooster Teeth changed animation software from Poser Pro 2013 to Autodesk Maya. With this change, the animation department also made all new models for RWBY. In Maya, Taiyang's character model has lips modeled on.