When the main title comes on in the traditional Shaft font, the copyright notice reads MCMLXXI, which is 1971, the year the original was released. The proper 2019 notice appears in the end credits.
Midway through the end credits, a hip-hop song abruptly stops, we hear a radio scanning, and then it lands in the middle of an old-school R&B ballad. This is a callback to a scene earlier in the film when Jackson changes the station on the car radio.