What is this plane seen in the Falcon Crest TV series?
That's a Cessna 210 Centurion II
.
The Cessna 210 models K, L, M, N and R have the windows shaped like the one shown in the picture from Falcon Crest. If it has a two-bladed propeller, it is a model K, the others have three-bladed props.
The picture below is a Cessna 210M.

source: www.airhistory.net, photo copyright: Phil Vabre