A boy in Samson's village is named "Saul." Samson hints or predicts that one day he will be king of Israel. The script states repeatedly that Samson was a "Danite" (member of the Tribe of Dan). The Bible states King Saul was a member of the Tribe of Benjamin and grew up near Jerusalem (not in Dan's territory).
The goof item below may give away important plot points.
As the huge statue of Dagon toppled in the climax, the flames in the fire within the stature "lean" as the statue leaned, before finally toppling over. This clearly shows the flames were images being manipulated, and was not real fire.