The amount of snow on the ground and sidewalks changes throughout the movie. This is noticeable starting in the opening minutes of the movie when Abel and Joey are driving through town.
The scene where Abel and Joey are driving in town and Joey honks the police car horn at Doreen Barker has numerous continuity errors. There are four camera angles: one angle is from the hood of the police car looking down the street, the second angle is from the hood of the police car and shows Abel and Joey up close, and the third and fourth angles are wide angles showing the police car and the entire street. The most noticeable errors are as follows: The number of cars following the police car and the distance between them and the police car changes from angle to angle; The make and model cars shown driving in the opposite direction before and after passing the police car change from angle to angle; Just before Joey honks the horn at Doreen you see two women walking down the street. The first woman, presumably Doreen, is walking on the sidewalk towards the police car and is wearing a blue hat without a purse over her shoulder. As Joey honks the horn he turns his head as if to look back at Doreen yet the very next camera angle shows Doreen wearing a white hat, red scarf, and different color blue jeans with a purse on her shoulder. She is also now walking in the opposite direction of the police car which has not yet passed her. As the police car passes Doreen you can clearly see that Joey is no longer riding in the police car.
After pulling Gus' body from the river, Abel and Joey's boots and pants are perfectly dry. It would've been impossible for them to pull the body from the river without at least getting their boots and pant legs wet.