Leading 5-1 in the first set, Djokovic was told by the umpire that he had exceeded the 24-second time limit on serve.
Djokovic argued with the umpire and had comments that the time clock was started while he was drying himself on the towel.
Djokovic got the crowd going.
He had a set point to win the first set 6-1 but Paul took advantage of Djokovic's annoyance to go 5-5 and make it a real fight.
When Djokovic was finally able to win the first set 7-5, he cupped his ear and turned to the crowd, then made provocative gestures.
Then Djokovic stepped up and played flawless tennis in the final two sets.
Paul didn't stand a chance as Djokovic showed perfection.
Djokovic stands at 21 Grand Slam titles, can take his 10th in Melbourne on Sunday, and equal Rafael Nadal who with 22 GS titles is the best in tennis history.
Djokovic's father watched the match on television at the hotel after being spotted in a video of Vladimir Putin supporters wearing Zs on their chests.