Not having the drawings connect to the actual video
If you think that this is impossible, then think again because it has definitely been known to happen. When the animator that is creating the drawing fails to somehow connect them to the video you run the risk of putting out a whiteboard explainer video that will likely mislead the audience and create misunderstanding. Another problem that this creates is that the audience cannot connect to the video in a way that you want them to because of the fact that the drawings are not connected to the video and that is a big problem indeed because that connection between the audience and the video is crucial for them to understand what the explainer is all about and for you to be able to capture their attention. So you need to make sure that each image and scene have a clear connection because that will give the video a seamless flow.
Making the video very colorful
There is no doubt that this is a big mistake and the name of the video- whiteboard explainer videos, should make that pretty clear. When you are creating this type of video it is crucial that you remember to stick to the black and white theme because incorporating a lot of color into it will make it look funny, and not in a good way, because the audience will be able to see that the video was meant to be a whiteboard one. The two primary colors used, usually that means black and white, represent the traditional form of these videos and you should really stick to that. There are some instances in which a pop of color is a good addition, but that pop of color needs to be just that- a pop, and not something that will overwhelm the rest of the video.
If the video is not very educational