It might be good to know that Cannell died in 2010 of melanoma, a change of color to the skin. Early additions had Cannell smoking a pipe while typing on the typewriter. In 1984, the pipe was gone, due to Cannell wearing a black jacket and dark colored sweater over white collar shirt.
In the early years, we just see Cannell wearing a sweater, In 1985, Cannell started wearing a polo shirt with the collar stuck up. Shows with this logo were The A-Team, 21 Jump Street, The Greatest American Hero, and several other 1980s shows.
On Family Guy, We see Peter typing on a typewriter, then he throws the paper.
On The Simpsons, at the end of an Itchy and Scratchy cartoon, the duo are shown typing on a typewriter and one of them throws the paper and a modified Stephen J. Cannell logo and instead, the paper is shaped saying I&S for Itchy and Scratchy.
One YouTube variant has someone typing on a typewriter then he throws the paper. The logo is in reverse and the paper hits his face.
1981: Cannell is wearing a dark colored sweater with white collar shirt, plus Cannell is smoking his pipe.
1983: Cannell is wearing a blue jean jacket and white flannel shirt over a black turtleneck, plus Cannell is smoking his pipe for the last time.
1984: Cannell is wearing a black jacket and dark colored sweater over white collar shirt, and the pipe was gone, because Cannell cannot smoke his pipe anymore.
1985: Cannell is wearing a white striped flannel shirt.
1987: Cannell is wearing a casual black sweater.
1989: Cannell is wearing a vermilion polo shirt, with the collar up.
1996: Cannell is wearing a black sweater.
2004: Cannell is wearing a black jacket with a black sweater.