Contradiction with Exodus 20:4
1 Kings 7:21 discusses the erection of physical pillars for the temple, which can be seen as contradicting the commandment in Exodus 20:4 against making graven images or likenesses.
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 Acts 7:48
In 1 Kings 7:21, the physical construction of temple pillars suggests a physical dwelling for God, which contradicts Acts 7:48 where it is stated that God does not dwell in temples made with hands.
Acts 7:48: Howbeit the most High dwelleth not in temples made with hands; as saith the prophet,