I thought they opted for CGI to give them realistic tails/fur?

Still looks like a bunch of people pissing about in leotards with a stocking stuffed with paper for a tail.

And what is with James Corden being shoehorned into lots of these roles, as though the Americans think it will appeal to the British audience?

Can't bloody stand him or his fake accent.

He's popular in the US and he's a pretty good singer, I think that's pretty much it.