It was literally on purpose. The line where he "mixed up the name" was about how Kendrick didn't know who he was fighting since Drake has ghostwriters. He showed in literally the next line that he knows who Osment is by referencing the 6th Sense.
This is all already on Genius.
I gotta be righteous, I gotta be me, I gotta be conscious, I gotta be free, I gotta be able, I gotta attack, I gotta be stable, I gotta be black.