When Kazaam is singing the song "We genie" with Max, if you look closely, when he raps the part, "...and we was in Hades 'cause we moved with the Harem of the Prince of Akabrem..." His mouth is still moving for that split second after he finishes the line, but before they show Max's Face.
Even though the movie is based in Brooklyn, while Max is talking with his dad in the car, you see a bus with Red and Orange stripes roll by. Buses in New York have blue stripes. Red and Orange were the colors of the Metro buses in Los Angeles in the early to mid-1990s.
The goof item below may give away important plot points.
Max appears to die. He is lying on his back and there's a wooden plank under his left arm and shoulder. In the next close-up shot, when Kazaam strokes his hair, the plank of wood is under his neck and head.