When the bus first drives onto the ferry for the river crossing, the sky is partly cloudy. The film then flashes back to events leading up to the crossing. When they show the crossing again, the sky is clear.
Her lover smokes filtered cigarettes in 1929. They were not invented until the mid-'30s and not in common use until the 1950s.
His cigarettes look like filter tips, but they are almost certainly meant to be cork tips.