The photo of Jess working on a car in the photo exposition is out of sequence. The car that Jess is working on is a 1966 Thunderbird. This is based on observations of the 1966 Thunderbird Dad owned. At the point in the movie when the photo was taken, the car was not fully assembled.
When the car contestants are assigned their car projects, the announcer states there's a 1970 Chevelle, it's not. It's a 1968 Chevelle. Also, during the judging scene, the 1968 Chevelle becomes a 1967 Chevelle.