When Dawson is repairing Amanda's car, he puts his physic book on the motor, then closes the engine hood but without taking the book.
Dawson's eyes change color from brown to blue through the years.
In '92 when young Dawson is driving, he drives by a parked newer red ford in a driveway.
When young Dawson and Amanda are at the top of the water tower at sunset, we can see the sun setting in front of us while their shadows are cast to the right.
(at around 1h 22 mins) Amanda talks about a song on the radio that she found when they were younger. Although we can hear her voice, her lips are not moving.
After trying to push Dawson's car under the train and shooting at him, both his uncles get out of their trailer, only to find out an empty car. Dawson managed to slide out and hide under it, yet neither of his uncles saw him get out and hide.
When Dupree telephones Amanda for the first time, he asks for Amanda Collier. Tuck knew that Amanda was married, and thus her name is Amanda Reynolds. The use of her maiden name is arguably only to provide the context to the viewer of Amanda having been Amanda Collier in high school in the 1992/93 scenes.
At the oil platform, Dawson posts an envelope with money but does not seem to seal it.
when Dawson and Amanda are pushing April's car, Dawson opens the engine compartment. Amanda's friends drive up and the driver of the car says, April come on but he should have said Amanda come on.