"Growing up with a twin you have a best friend and a worst enemy built into one," he said. "That always seemd like an interesting relationship for a TV show."
Friday's 9:30 p.m. episode, "Tourist Trapped," features a take on the Loch Ness Monster legend and an ending out of a "Scooby-Doo" episode but Hirsch said that's not representative of the series.
"I've always been aware of 'Scooby-Doo' but I would say the show is much more influenced by half-hour comedies like 'The Simpsons' than something like 'Scooby-Doo,'" he said. "The big difference is ['Gravity Falls'] is much more focused on the characters than it is on the mysteries. It probably has more of a character comedy aspect to it. As fun as 'Scooby-Doo' is, it's kind of the same every week.The bad guy always pulls off the monster mask and it turns out to be Old Man Jenkins. We have one or two episodes that riff on that cliche but we really are from episode-to-episode a very different show. Our third act mysteries run the gauntlet from fake monsters to real monsters to real time travel. Our show is more varied and weirder even than 'Scooby-Doo.'"