I think the road alignment is incorrect here.

I believe there is a 300m (roughly) section of unmapped shared use pavement/cycleway here. Given the general road (etc) and visitor centre this may be locally significant enough to make it worth mapping.

I believe the minor road here (Station Road) has now been removed.

Previous buildings demolished - something to be constructed?

I believe there to be a 500m stretch of cycle route parallel to the road here, but I'm not local to survey.

A new footbridge is being built here. My information is from a public notice here:
http://www.falkirk.gov.uk/news/article.aspx?aid=4540
Also documentation here:
https://www.publiccontractsscotland.gov.uk/search/show/search_view.aspx?ID=OCT259923
Which includes a map with a (written) Ordnance Survey grid reference for the bridge of:
289728E 682636N
The implication of the article on falkirk.gov.uk is that it will open between now (May) and 'the summer'.

Castlebank Street should have a shared use path along the south side. Survey required.

Much of National Cycle Network route 73 has been signed but is recorded in OSM data as proposed only (see proposed route line here relation/1328554 ). Stranraer end (west of Glenluce) may not yet be signed.