The black and white footage is from the "Studio One" show entitled "The Defender" (hence the "Son of the Defender" title of the Boston Legal).
http://us.imdb.com/title/tt0394920/
The father was indeed played by Ralph Bellamy (who would go on to star as Randolph Duke in the Dan Ackroyd/Eddie Murphy comedy Trading Places). The character names are exactly the same as in the "Studio One" episode. The character of Joe Gordon was played by a very young Steve McQueen. The plot of the Boston Legal episode closely parallels the plot of the original Studio One episode and the character names are the same. The only difference is the name of Shatner's character, but everything else, down to the strained relationship between the lawyer and his father are similar.
http://us.imdb.com/title/tt0394920/
The father was indeed played by Ralph Bellamy (who would go on to star as Randolph Duke in the Dan Ackroyd/Eddie Murphy comedy Trading Places). The character names are exactly the same as in the "Studio One" episode. The character of Joe Gordon was played by a very young Steve McQueen. The plot of the Boston Legal episode closely parallels the plot of the original Studio One episode and the character names are the same. The only difference is the name of Shatner's character, but everything else, down to the strained relationship between the lawyer and his father are similar.