So Jessica and Arby are siblings, and Arby's real name is Pieter, it can not be coincidence there's a Jessica Rabbit and a Peter Rabbit.

Anyway, hope Arby's still alive - he's a great character

I never thought for a moment that the phone given to Ian didn't contain a tracking device. Surely a bunch of newly-suspicious fugitives might have considered the possibility.
The scene at Dugdale's house before and during the raid by the cops was a bit hard to credit, as was Mrs D's rapid adoption(!) of the plan to adopt his mistress's baby, to be cared for by the no-good, philandering man himself. No stored up issues there then...
Good point about the Peter and Jessica rabbits. I figured there would be a twist about the identity and I'm guessing it's both of them.
I also like the idea that the evil master plan is actually relatively benign, except for the impending doom of the uncared-for elderly.
There's definitely a feeling that it's building to a climax.

What was going to happen when Dugdale's wife discovered she wasn't pregnant (I can guess, but it was hardly made clear). Why were "Anya"'s handlers happy to let her go along with the whole thing? And did he really think he was going to walk off into a happy sunset with an 11-year-old girl with scorching PTSD and a murder on her conscience? Not to mention a dad somewhere, presumably? Social services will love that one.
Wilson's conversion to the Janus cause was hardly explored - other than to get him stabbed, twice.
Why did Milner just send Becky, Ian and Grant off on a jolly to Scotland (with what money? And with Grant still theoretically facing several murder charges). Indeed, was Grant not being watched on CCTV as he fashioned that highly effective faux-rabbit killing dagger?
And Letan. So, he had the Chinese word for rabbit scarred into his belly, so that when some unidentified future assassin heard about it, he would kill him, believing he was the rabbit protecting his/her true identity. Er, WHAT?