On the set of the earlier Clint Eastwood movie The Enforcer (1976), Eastwood entertained the crew by singing and playing piano between camera set-ups. Publicity for this picture reported that Eastwood said "I'm a self-taught ragtime player. I like to relax by playing some barrelhouse after I've been shooting 'em up on the set. I try to sing along at times, too, but singing is not really my bag. I can sing only fairly". Eastwood sings frequently in Honkytonk Man (1982).
The guitar Red Stovall is playing is a Gibson L-5C manufactured around the 1970s. Although Gibson launched the L-5 in 1922, the particular instrument Red plays in the movie is definitely not from the era the movie was set in. The L-5P was launched in 1939 and was superseded by the L-5C in 1948. The letter "C" in L-5C stands for "cutaway" whereas the letter "P" in L-5P stands for "premiere". The tuners and the "Gibson" logo on the guitar's headstock are distinctly 1970s.
Red Stovall: Mary was right to go back to her husband. What the hell did I have to offer a kid? Just honky-tonks and flop-houses. That's the life of a country singer, Hoss. Sound good to you?