Contradiction with Exodus 20:4
This verse forbids the making of graven images, which might contradict with any craftsmanship or decoration described in Exodus 38:13.
Exodus 20:4: Thou shalt not make unto thee any graven image, or any likeness [of any thing] that [is] in heaven above, or that [is] in the earth beneath, or that [is] in the water under the earth:
Contradiction with Exodus 31:4-5
This verse celebrates skillful work in crafting the tabernacle, which might seem contradictory if Exodus 38:13 suggests that craftsmanship is unnecessary.
Exodus 31:4-5: To devise cunning works, to work in gold, and in silver, and in brass,