We know what we have learned from the series finale of "How I Met Your Mother" but there were a few things that we did not know. For example, all of the scenes with Ted's teenage kids were filmed during the first season for age issues. And second of all, Josh Radnor aka Ted has his own thoughts on the epic finale, which he knew about all along. Most did not want to know how the series would end but Radnor stayed in the loop and pretty much knew what the final outcome would be from day 1: