Contradiction with Exodus 34:24
Unlike Exodus 23:17, this verse specifies three times when males must appear before the Lord, adding a specific occasion related to God enlarging borders.
Exodus 34:24: For I will cast out the nations before thee, and enlarge thy borders: neither shall any man desire thy land, when thou shalt go up to appear before the LORD thy God thrice in the year.
Contradiction with Deuteronomy 16:16
This verse also instructs appearing before the Lord three times a year but includes precise feast names that differ from those in any other context.
Deuteronomy 16:16: Three times in a year shall all thy males appear before the LORD thy God in the place which he shall choose; in the feast of unleavened bread, and in the feast of weeks, and in the feast of tabernacles: and they shall not appear before the LORD empty:
Contradiction with 1 Samuel 1:3
This describes a time when Elkanah went yearly to worship, which contrasts with the three-times-a-year requirement specified in Exodus 23:17.
1 Samuel 1:3: And this man went up out of his city yearly to worship and to sacrifice unto the LORD of hosts in Shiloh. And the two sons of Eli, Hophni and Phinehas, the priests of the LORD, [were] there. [yearly: Heb. from year to year]