Could be any automatic assault rifle, but usually refers to an AK-47. This is reinforced by the direct AK reference a few lines later.

Legendary film director Alfred Hitchcock, known for making frightening and pulse-pounding thrillers like Psycho and The Birds.

Redman does not want to get caught up in a copyright infringement case like so many rap artists before him.

Anyone who’s had the cops at their door knows that police knock in a very distinctive way. They tend to pound with the meaty part of the fist rather than rapping with the knuckles.

A corruption of the Spanish phrase “sin semilla,” meaning “without seeds,” sensimilla is a general term referring to very potent marijuana.

The narrator (god) is by no means all-powerful, he is simply more powerful than the humans he created.

One common critique of religious morality is that god-fearing people believe that their sins can be forgiven even if they do not feel remorseful or attempt to make amends. In particular, Catholic confession is seen by many as a “get out of jail free card.”

Jews observe the sabbath on Saturday (technically beginning at sundown on Friday). Christians used to do the same, until the Christian sabbath was changed to Sunday sometime in the 300s. Some Christian denominations, like Seventh Day Adventists, still observe the sabbath on Saturday.

“Si Dieu n'existait pas, il faudrait l'inventer"
(If God did not exist, it would be necessary to create him)
-Voltaire

Humans are so intellectually arrogant that they presume to divine (pun intended) the nature of God based on what would be most convenient for them.

Apparently the human race was created on a whim. The creator admits that he didn’t think the whole thing through very well.