If you read it you will be unable to unsee it so…
look at Rey’s feet in the wide shot of Rey running. First, the lightsaber is discolored as red. Second, she is kinda floating since her feet don’t actually touch the ground.
Holy crap! You’re right! The discoloration of the saber is only in the reflection in the water. Rey does look like she’s walking in place, like an unfinished game bug.