12:4 too little for the lamb. Note that the lamb was never too little for the household. The lamb, of course, is a foreshadow of Jesus Christ, the Lamb of God (John 1:29) our Passover (I Corinthians 5:7) without blemish, sacrificed for us (I Peter 1:19).
12:7 take of the blood. The blood was to be “given” (same word as “strike”) on the sides and above, but not underneath, where it could be stepped on (Hebrews 10:29).
12:9 the purtenance. That is, the internal organs.