Contradiction with Deuteronomy 9:5
Suggests that deliverance was not due to righteousness, which may contrast with "his mercy" being the cause in Psalms 136:24.
Deuteronomy 9:5: Not for thy righteousness, or for the uprightness of thine heart, dost thou go to possess their land: but for the wickedness of these nations the LORD thy God doth drive them out from before thee, and that he may perform the word which the LORD sware unto thy fathers, Abraham, Isaac, and Jacob.
Contradiction with Lamentations 3:22
States that it is of the LORD's mercies that we are not consumed, which complements rather than directly contradicts the mercy mentioned in Psalms 136:24.
Lamentations 3:22: [It is of] the LORD'S mercies that we are not consumed, because his compassions fail not.