To me, this keeps getting better as the episodes go on. Even though I haven't fully played Half Life 2 or known anything about Initial D (sorry), the episodes and the humour was great. Clever references and cameos galore.
I'm guessing Topher's learning new stuff as he goes along, which can only make things better.
I must admit, I don't quite get how Mrs Beedog is still as young and awesome as ever, maybe because of her powers? If you say it's fiction, I will quickly correct you; It's JOURNALISM! :)
Keep up the good work.