Screwed by the Network: The show was moved around on the schedule every few months, and new episodes were rarely advertised. As a result, only diehard fans could actually keep track of it. And if you missed an episode you were pretty much out of luck due to lack of reruns.
Viral Marketing: Early ads for the show were just live action shakycam footage with CGI cryptids that had the URL cryptidsarereal.com at the end. Later ads used the same footage from the previous ads mishmashed together with Argost's voice-over advertising Weird World. They eventually advertised the show itself about a month or two before its premiere.
What Could Have Been: The show's creator originally pitched it as the adventures of three animal heroes (all of them previously thought to be mythical in Real Life, like the okapi) as they prevented an evil dodo bird from exposing the existence of other cryptids. Nobody wanted the show like that, so he reworked it heavily into what we know today.