As well as the old pier, which the Maggie demolishes, there is a long wharf, a large row of buildings including the supposed pub and a road down to them. In my recollection the quayside at Crinan (east of the sea lock) isn't long enough, and while I suppose false buildings could have been put up, the street looks too big to me.
Here's the quayside

and here's another shot showing the end of the road down to the quay

Can that really be Crinan? And if so, how did they fit it in?