We have this too: http://www.wrongplanet.net/postt193214.html
In the pilot film (just watched it again), a social worker talks about that Jake is diagnosed with autism/is an autistic child.
The father also later searches for mutism/autism on the internet.
There's a sort of mistake during that scene though, he's shown searching something on the internet about his son, a website's description (that catches his interest) is shown to include the word "mutism". Next, he's shown for a couple of seconds again, then they change back to the computer screen on which suddenly the word "autism" has replaced mutism in the description.
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett