Here is the complete set of css selectors that will hide all four possible types of arrows:
.rsArrowBottom, .rsArrowTop, .rsArrowLeft, .rsArrowRight
visibility: hidden !important;
As for the href attribute of the arrow link, we are not sure why you get such values. To determine if the problem is related to RadScheduler or not, I suggest you add a simple link to your page with href="#" and test if any url is preappended to it after you view the page in the browser.
the Telerik team