I can understand why you might think that. I can also understand that we might all wish it were a glitch. However, as a former coder and technical project manager, I can tell you that the coding that powers Google search trends is the same coding throughout the entire trends functionality, so if there were a glitch in this graph there would be a glitch in all trends. This use of coding, rather than doing new coding, is the standard for all reasonably similar functionality throughout the Internet.