If you want to see a listing of all changes made to the file and the delta in which each was made, you can use the -m and -p options to get:
$ sccs get -m -p program.c 1.2 1.2 #define L_LEN 256 1.1 1.1 #include <stdio.h> 1.1 . . . 84
To find out what lines are associated with a particular delta, you can pipe the output through grep(1V):
$ sccs get -m -p program.c | grep '^1.2'
You can also use -p by itself to send the retrieved version to the standard output, rather than to the file.