As a singer/songwriter, Bob Dylan is admired for his lyrics. He wrote a vast number of songs, some of them quite long and full of fairly dense narrative -- or, in many cases, clever-sounding gibberish:
Better jump down a manhole, light yourself a candle
Don't wear sandals, try to avoid the scandals
Don't want to be a bum, you better chew gum
The pump don't work 'cause the vandals took the handles
Here we have a stanza full of interesting but generally meaningless rhymes:
manhole : candle
sandals : scandals
bum : gum
vandals : handles.
I wouldn't overthink this, as quite a lot of Dylan's songs contain similar phrases. It's just his style.
As for your original question: It's not uncommon for English speakers to fail to conjugate the verb, although this is usually interpreted as either "country" or "poorly educated" (or both) depending on the context. Examples:
She don't like fish.
They is going to the store.
He write to his momma every week.
Writers and songwriters who like to appeal to the "common man" (such as Dylan) will often use this kind of dialect, even though it's clear from their facility with the language that they know proper grammar.
As with any dialect, I do not recommend mimicking this unless you fully understand how to use it and the full cultural context. There is a fine line between imitation and mockery, and some people might take offense.