13.2 It seems like this is part of a larger principle--that the first of everything is given to God. (I would see it as a symbol that the rest is His too.)
13.8 You shall tell you son...
13.16 This verse seems to clearly indicate the figurative nature of the mark on hand, frontlets between eyes, etc. language
13.17 lest the people change their minds when they see... A practical thought in the vein of 1 Cor 10.13.
14.4 I will harden Pharaoh's heart ... shall know that I am the LORD... Pharaoh was a pawn in God's bigger scheme with the aim of His fame and glory.
14.14 you have only to be silent... Something most of us struggle to do.
14.25b compare with verses 4 & 18.
14.31 the people feared the LORD...