Revealing mistake: When the cops bust the lab where the dope is cut they push a big man in a white T-shirt. The blood pack on his back is very noticeable.
Continuity mistake: When Bumpy enters the shop the amount of people outside changes at least three times.
Revealing mistake: When the man is set afire he is very obviously covered in fireproof gel.
Answer: "Kike" is an ethnic slur that refers to Jews. To elaborate, when illiterate Jewish immigrants would be asked to sign their names on Ellis Island, they would simply put a circle on the signature line. The Yiddish word for "circle" is "kikel."
OneHappyHusky