Your baby bumblebee is just showing off his wobble. Wobbles can vary in degree. Before I sold my spider, the only real noticeable wobble she had was when she was striking. She would mis-strike a time or two but then eat fine. I wouldn't worry about it.
As for your friend's snake, it sounds like there may be 2 problems: 1. It sounds like her snake may be hungry. What is she feeding it? 2. Since the "aggressive" (though probably more defensive than anything) started once she was moved to a bigger tank, there is something stressing her out. The cage could be too big, the temps could be off, there needs to be more hides, etc. It's hard to pinpoint a cause until we know EXACTLY how she's keeping her ball python and what it's eating.