Contradiction with Leviticus 6:26
This verse instructs the priest to eat the offering in a holy place, contradicting the outdoor act directed in Judges 6:20.
Leviticus 6:26: The priest that offereth it for sin shall eat it: in the holy place shall it be eaten, in the court of the tabernacle of the congregation.
Contradiction with Numbers 18:11
Here, offerings are designated as holy and are to be eaten by the priestly family, contrasting the angel's command in Judges 6:20 to place the food on a rock.
Numbers 18:11: And this [is] thine; the heave offering of their gift, with all the wave offerings of the children of Israel: I have given them unto thee, and to thy sons and to thy daughters with thee, by a statute for ever: every one that is clean in thy house shall eat of it.
Contradiction with Genesis 8:20-21
Noah's offering is consumed by God with a pleasant aroma, differing from Gideon's offering being consumed by fire from the rock in Judges 6:20.
Genesis 8:20-21: And Noah builded an altar unto the LORD; and took of every clean beast, and of every clean fowl, and offered burnt offerings on the altar.
Contradiction with 1 Samuel 2:16
This verse speaks against taking offerings raw, whereas in Judges 6:20, the meat is laid raw before it's consumed by supernatural fire.
1 Samuel 2:16: And [if] any man said unto him, Let them not fail to burn the fat presently, and [then] take [as much] as thy soul desireth; then he would answer him, [Nay]; but thou shalt give [it me] now: and if not, I will take [it] by force. [presently: Heb. as on the day]